mate, I literally feel your pain it took me 6 months to even get a doctor take me seriously enough to refer me to a neurologist. And like you I am DESPERATE to get exercising again. My head ache sounds very similar to yours pounding pressure especially behind the eye and brought on badly by exercise. The only thing I can recommend trying is lions mane as per my previous post. at the moment I have been head ache freeish for a week, from about 7-10day of taking them. if you do try them its important you get high quality as some cheaper one made it worse.