I took finasteride for hair loss for 2 months after getting horrible brain fog and erectile dysfunction i quit. now after a month off of it i still have horrible brain fog. i cant think, what do i do? is my brain damaged?

Brain fog: Although hormonal changes can affect your concentration and focus, I doubt that the finasteride is the culprit after 2 months off it. Other factors include stress, lack of good sleep, poor diet, negative thinking, lack of enjoyable activities including regular exercise.and alcohol, if excessive. Stress management or cognitive behavioral therapy along with some lifestyle changes should help you.

Need to examine: It is not feasible to provide a meaningful opinion without taking additional history, physical examination and may be some tests. It would be prudent to see your doctor and discuss if you may be depressed. Counter-intuitive as it may seem, exercise may help. Start with low intensity exercise such as walking and gradually increase the intensity as tolerated. Wish you good health!