Constant Nausea (Going on 3 months now)

Its as the topic says, Im 20 years old, I'm male, 5'8 208ibs. Been feeling CONSTANTLY nauseous the last 3 months now, everyday, all day, 24/7. I USED to have bouts of dizziness/fatigue during the first month this started happened, but has since dulled down. So far, I've been to the docs severalllll times, all baring no results at all. I've had so far: -An MRI (all normal) -An Upper GI (ultrasound) (all normal) -Celiac disease test (negative) -I've been referred back to the GI for an endoscopy (DEF. not looking forward to that, horrible fear of anything being surgically done to me) -I've also been referred to some sort of "Inner-ear" physical therapy class, but seeing as though that was for the dizziness/fatigue i no-longer have, I see thats all quite pointless. I've been perscribed many medications, all to no avail whatsoever. -Prilosec/Promethazine (12.5/25mg)/Meclazine/Zofran ODT With only the promethazine helping in SOME SMALL WAY, by making me incredibly drowsy, passing out so feeling the nausea is completely avoided while sleeping... This is really taking a mental toll on myself, I have not worked in 3months due to this, I barely go out anymore, I've got a very bad loss in appetite, (I was 248ibs at the beginning of this, now I'm weighing close to 208ibs and dropping every week.... I've COMPLETELY changed my diet, I only eat soy products, low-in-fat foods, I do NOT drink/eat dairy products anymore.... Which I loved btw, no sugar or wheat, I eat gluten-free products. This is really taking a mental toll on myself, I have not worked in 3months due to this, I barely go out anymore, I've got a very bad loss in appetite, (I was 248ibs at the beginning of this, now I'm weighing close to 208ibs and dropping every week.... The nausea is bad somedays, where other days its tolerable, but still menacingly aggravating to deal with, I feel like giving up, I'm getting no answers, no relief, it makes it so hard to sleep at night because of this, or have a social life whatsoever, and im quite the social person... If any of you have any of the same symptoms or stories that could help point me in any direction towards a well being, please, do care to mention them. Im on my last leg and limb with this aggravating ordeal, and doctors are proving to be overly expensive and are helping in no way shape or form. Thanks for reading, any advice would be wonderful. ~Ryan