pressure in forehead

for 1.5 years i have had a nearly constant pressure in my forehead and sometimes temples / upper nose / eyes / cheeks. it starts about 20 min. after waking with no distinct trigger, and quite often it lasts all day. the pressure can be intense, and ALWAYS gets worse when lying on my back. i was under stress, but 6 months ago i removed everything, girlfriend, job, even my apartment -i now live in a van because i can't do anything in this condition. im 26 and have been told so many times now that im in excellent health, so what is going on? i have had bad posture and even worse sleeping conditions for the last 5 years -could it be something to do with my back? all of my money has gone to doctors, i've got nothing left -your experiences, opinions, advice, guidance, questions, etc.. are incredibly appreciated!! please help me get back to just living!    -scott