Really need some answers

Im not sure how to explain all this but I am really struggling. Im hoping someone out there is in the same boat. I have had a depression issue for a while so everytime i see a doctor they shrug me off and tell me im just nuts. For years now i have been struggling with quite a few symptoms and it has left me struggling to keep going. Sometimes its worse and other times its better but its always there. I feel as though i am on the verge of collapsing. Things around me seem slower. My words dont seem to come from me. Things confuse me and my memory has faded dramatically. It will start the second I open my eyes and continue until bed. I have a problem with migraines alot and they certainly dont help. Sometimes my words come out wrong or I will forget how to spell. I feel faint alot and shakey. Everything is just fuzzy. I have smoked quite a bit in the past and can accurately describe the feeling as the moment your high hits you except its terrifying and not relaxing it all. It never ends. I dont know what to do anymore. I am at a loss. If anyone has any answers or ideas or has felt the same way please let me know.