Look for dopamine supplementation and see if it helps with your brain fog. Try to test yourself for testosterone dopamine and prolactin levels after O, for example, to see what could be wrong and what to do.Also, for me, testosterone works better than Niacin with the brain fog, perhaps it will with you. If that does not work, you need abstinence, and for that there is Dopamine antagonists. It is used to control the symptoms of hypersexuality and increased orgasmic activity. Sex behaves like a drug addiction, it rewards you with dopamine and therefore you will always want more. In theory, a dopamine antagonist could help with abstinence. You could go to a doctor and demand hypersexuality treatment with dopamine antagonists or try the desensitazion. Have you tried antihistamines and IgE blockers?
Please do not give up until you try everything, and report if anything has helped you.