Welcome to the forum and I’m sorry you’re here.
I highlighted some things that I think many users of finasteride have found out or will find out upon discontinuing the drug based on information I’ve seen on this forum. What’s really bad is these cognitive impairments affect reasoning to even understand what’s happening to the person suffering them which makes discovering or understanding the change more difficult.
I suggest you read through the main site (propeciahelp.com) thoroughly before beginning on this forum. You should get a full testing done, recommended tests can be found on the blood test section of the forum.
Some things that help members here with cognitive symptoms are fasting, a raw food diet, paleo diet, very moderate exercise and getting enough sleep, eliminating caffeine, alcohol, sugar, and any foods you might be allergic to. You might gain your mental energy back ever but these things and time (sometimes up to 1.5 years) can help with brain fog. IMO, once you’ve taken these steps and gotten your blood work, it’s then a good time to consider hormonal treatments or other medical treatments. Some other people will suggest looking into HRT asap so you need to evaluate this info based on your needs/risk tolerance.
You will find very varied opinions on this site and a problem we have is that some people are very sensitive to things while others don’t even respond to them. We also have a problem of developing tolerances to things like PDE5 inhibitors, so be careful about what you put in your body and try to cycle supplements. Take it slow and try not to stress yourself.