chronic headache that never went away

Hi I'm a 19 year old male living at home struggling through well a lot. A quick back story when I was 16 I developed this chronic headache that never went away right above my eyes, as well as neck and back pain, a tight chest, and chronic fatigue. I went to many doctor appointments to try to solve this problem, and to make a long story short they never found the problem. I continued to do well in high school academically and socially even though I was in a lot of pain, and I really didn't feel like myself it was a weird feeling. For what I was going through my mood was generally pretty good, I just felt like I had a dim future because the pain I was in, and I felt like I was in a different reality almost, because I felt like I was the only person in the world that had this chronic headache problem. Anyway jump ahead to my first semester of college I definitely started feeling more depressed and I began to feel worse and worse. The summer before school I began to drink and smoke marijuana almost everyday and took that habit to school with me. By the end of the first semester I was almost like an alcoholic, and a pot head, but I felt like I need these substances to get by. I got back to school for the second semester and I begin to feel ill during the first week I knew something wasn't right. However, I decided during the weekend to indulge myself in a rather large "weed brownie" right after a long night of drinking worst idea of my life I had a HUGE panic attack; I felt like an entire different person, and I just had to go the ER. Got diagnosed with a virus I was put on Prednisone for a week, and I decided to go home that week to try to get better. I got home and I was just terribly depressed, I literally couldn't sleep at all and I felt really ill. I went to see my doctor and he tested me for any viruses, and infections and he couldn't find anything. He also sent me to get x rays of my neck and sinuses, and only found damage in my neck due to muscle spasms. I went back to school, and I lasted all of two days and I got really sick I had a fever for five days, I couldn't eat, my throat was so swollen it was awful. I went to med express by my school and they just found that I had some infection, but no mono. My parents wanted me to come up to rest, so I did and at this point I was feeling VERY depressed saw my doctor again and he tested me for mono again come back negative. I also did a blood test that tested basically everything, and no abnormalities were found. He put me on celxa and decided that I was mentally unfit to go back to school due to depression. So I was put on a medical leave. A week later I had MRI of my head and neck, and the only thing that was found was swollen lymph nodes and adenoids pressing against my optic nerve, which could've explained the headache above my eyes. I was given a nasal spray for it, and it actually helped. I also got set up with a therapist which has helped, and a psychiatrist. The talk therapy helps, but I understand it's the long process. The psychiatrist however, made me due all of these tests and diagnosed me with bipolar disorder (I don't agree with because I feel that I'm just depressed), depression, anxiety, and adhd. He had me stop taking the celxa which I was happy about, because it made me feel worse, and put me on Depakote which Ive been on the last 2 months and I can't stand. I have an appointment at the end of April with him and we are switching meds, so I'm slowly weening myself of the Depakote. So here we are now I don't know if it's the medicine doing this to me, or its the depression but i feel like I lost my personality. I don't know who I am anymore. I still have real depressed thoughts, and I just feel so low. During some parts of the day I feel ok when I'm thinking more positive, but if I have a depressed thought I feel so sick I can hardly walk, and I get the worst headaches ever. I'm unsure if the headache's I get now are related to the headaches I had prior to the MRI, but nevertheless it still feels like I have a headache everyday. I constantly worry about everything and anything, and my stress level is at all time high. Physically my back, neck, muscles, and joints are in a great deal of pain. I feel SO weak, and I'm just so fatigued no energy whatsoever, but then I can't sleep. My eyes get real heavy, and my vision even gets blurry. I always feel this ''fog" in my head, and my head also feels like it's about to implode. I feel like everyday is my last, and I can't seem to enjoy anything at all. I'm always confused now and I just feel dumb. It actually hurts to think. When I look ahead I see nothing, and I feel like I'm just waiting to die. I can't get the thought out of my mind that my doctors are not finding something, or missing something in my tests. It's awful I can't function like this. My parents are making me work 5 days a week and it's just too much. I have a appointment with the neurologist April 11, so maybe he'll finding something. So what do you all think?? Is it mental, physical, a combination??? Do you think what I'm going through now is all related to what I went through in high school?? Thoughts, advice, opinions, or whatever would be so appreciated! I'm just so scared :(. I know this is a very long post so thank you very much for whoever reads it through!