Replying to I think somethings wrong with me

ive been feeling sick, and my eyesight seems to be diminishing, i have this constant pain deep inside my head; if you know what it feels like when youre depressed its kinda like that. that dull pain that just hurts all the time. ive become irrational and i cant speak correctly. im stumbling over my words and im forgetting what im trying to say midsentence. i really have no idea whats going on and the panic is setting in. ive gone to the doctor and they dont know what to tell me. i'd have to get my brain scanned and i just dont have the money for that at the moment. anyone a medic?