Just wondering if you have had any concussions?
I tried a high protein , low carb diet too but I just could not train to save my life. CJenks I could only do it for 2 months and had to stop. Geez i dont know how you did that for years…
I do not know a lot about it but I have a long standing client who recently got a surprise hit to the head. The person described the symptoms as a brain fog.
My only other piece of advice is no one will advocate for you better than you. If you have some issue and you don’t know what it is do what ever you are able to figure it out and get the tests you need.