I have been struggling for the past 3 years with concentration problems, need second opinion?

Hello!

I have been struggling for the past 3 years with concentration problems (brain fog).

I have changed my diet to only homemade meals, fruits, vegetables and nuts. I only drink water and a coffee per day. I exercise more. On my diabetic father’s advice, I have taken my blood glucose for a while and it falls within normal range. I have stopped smoking marijuana. I have tried every trick on the internet but I still can’t shake it off.

I feel better physically but mentally it’s not much better. I went to see my doctor and he ordered many blood tests: Vitamins, STDs, Thyroid, Lyme disease and a bunch of other that i don’t remember. Everything came back clear. His conclusion was to prescribe me anti-depressant. Effexor to be precise. To be honest that medication scares me and I did not take it. Mostly because, once in a while my head clears up completely and I feel like I used to. I just can’t put my finger on the cause.

I would like to have someone else’s opinion on the matter. Taking Effexor would be an absolute last resort for me since my mother and everybody on the internet say it’s hell to quit. Is there anything else I should try? Should I ask to be referred to a specialist of some sort?

Please help me. I do not know what to do,

Age: 28
Male
Medications: Nothing.
General Information: I did and every test he did came back clear. He prescribed Effexor but I dare not take it until it is my absolute last resort.