Sick and need some help

It's been 15 days for me, but it's been hell. I started smoking consistently when I was 15 and now I'm 23 and trying to quit. I smoked morning, noon and night, straight to cold turkey. The first 2 nights, I didn't sleep at ALL! I couldn't even fight it, I just stayed up all night on the internet until I passed out at 7 in the morning from exhaustion, and even then I only slept a few unrestful hours. Around day 3 and 4 I was so irritable, angry and violent. I threw all sorts of sh*t around my house and even broke my brand new phone. My boyfriend said one little thing that upset me and I went on a rampage! By day 5 and 6 I was starting to sweat a little bit, just had an overall greasy feeling all the time and I just felt anxious and paranoid. I'm an emotional mess, happy one minute and sad the next. I feel useless, lonely, depressed and slightly suicidal. I would never kill myself but I have visions of holding a gun to my head all the time. My dreams are so intense, I feel a bit afraid of going to sleep. I dream of spewing blood and other horrible things. Now it's been 2 weeks, getting to sleep is a bit easier but now I feel like I'm constantly holding back a deep gutteral cough that if I let out I feel like I'm gonna puke. Just reading these posts are very helpful though, I feel like I'm not the only one dealing with this sh*t. I have had chances to smoke, but I feel like I've set my mind to quitting so I will not allow myself, I feel like if I were to smoke, the guilt would override the joy of being stoned, so I wouldn't even like it anymore. I just am sick and tired of being dependent on something that I just can't afford mentally or economically anymore. I literally don't find anything fun or exciting anymore, and I really hope this feeling will go away, but I've read this can last 3 months and longer. I just have to rely on my will power and hopefully all these feelings will get less and less with each passing day. Thanks to all that have posted, it really has helped my sanity!