I'm 16, a girl, and have had this really awful feeling in the back of my head since September (at least that's when it got noticeable.) It seems to have both physical and psychological facets, and it's really hard to describe...it lets up a little at times, but it's mainly constant and makes me feel absolutely terrible. (just to be clear, I never have anxiety about my health--this isn't just hypochondria.)

I do have anxiety though (social, existential, etc.) I could probably be diagnosed with avoidant personality disorder; although I'm not agoraphobic or anything, I definitely have a problem with distancing myself from people. I don't want to, though, so this causes a lot of stress.

I've been depressed for about 3 years. But somehow I feel like I wouldn't either be dealing with this depression or anxiety nearly at all anymore if it weren't for this feeling...it's like everything's out of my control, I can't deal with anything right now. And I feel like even if I were to make major changes in my life that would have otherwise solved a lot of my emotional issues, it would have no impact on me. I haven't felt genuinely happy for more than a few hours in the past four months, and haven't felt at ease for a moment. but I have hardly any reasons for feeling anxious, and what I had been depressed about I'm at least optimistic about now.

Anyway, it's this extremely heavy (physically and in all other senses) feeling. It's like, a deep feeling of uneasiness and extreme tiredness. maybe it could be described as pressure? It's right above the back of my neck, to what seems like the middle of my head. I've been trying to ignore it and it actually seemed like it was letting up a few days ago, but right now it's at the worst it's ever been. 

I've never been on any medications for depression or anxiety...I went to the doctor in November and she thought it might be a weird kind of sinus pressure, but taking stronger allergy meds didn't seem to help. She told me if they didn't to get an MRI, but I don't really think anything's going to show up. I seriously doubt I have a tumor, since all my headaches seem to be from tension and are really mild, though I have them pretty much every day.

I don't eat very well (probably too much sugar, processed foods, wheats, etc) but I'm underweight and probably don't get all the nutrients I should. last time I got bloodwork it showed I wasn't anemic, but I'm wondering if that could be it now?

maybe it's neurotoxins, or something? I live in eastern Ohio where fracking is going on and supposedly our water is being polluted with some pretty nasty chemicals. and I had been taking Benadryl every night for at least 4 years, but I didn't want to be dependent on it anymore (it was for allergies, but then I needed it to sleep) so I've stopped over the past few months. can't remember if it was before or after this feeling started. and I've heard Benadryl has bad neurological effects.

Sorry this is so long!

So my questions are:

- what the heck is this?
- how can I relieve it? (exercise, being outside, protein shakes and V8 juice, not using computer / watching tv, sleep  didn't help)
- what should I tell my doctor now? (already explained most of this to her in Nov.)
- what can I do to relieve the discomfort? 
- should I get an MRI?