hi Kyros,
Meditation can help you with the Brain retraining. I did a program called Gupta, it has helped me with Brain. Now i enjoy moon meditation as often I see the moon, and I have found a relaxing hobby with watercolor painting in adult coloring books. I try to spend an hour a day doing this if possible.
For the Candida, years ago I took Cololdial Silver. Now I try to limit my sugar and have gave up alcohol. I use maple syrup as my main sweetener. And is VERy important that I take very strong Probiotic daily to maintain Gut health.
Mood and anxiety for me are controlled by balanced diet, adequate sleep (in a dark cool area) loads of fresh air (daily walks) opening windows in car and home as much as i can and I take magnesium glyclinate which helps and also helps with stiff muscles and constipation.
I used to supplement the Vitamin D and now I just spend an hour a day outdoors.
It is my guess that exercise may be killing off some of the Epstein Barr which causes a rebound of symptoms. I have that too and have not figured out a good protocol for it. But exercise on a regular less intense schedule seems to help. Good luck to you.