Hi Pentrazemine,
You have come to the right place for understanding and help. You will find much useful information on this forum.
You are not alone, and POIS is real. There is over 400 members who have the same problem as you have, so it is not your imagination. Symptoms, severity and duration may vary from one sufferer to another, but brain fog and impaired mental capacity, like you have, is fairly common. Extreme fatigue is also a commonplace for POIS sufferers.
There is nothing showing in blood tests, and there is no diagnostic criteria yet, apart from some criteria of clinical presentation established by Dr Waldinger, the doctor who was the first to write about POIS. Most MD never heard of it, have no information about POIS, and thus, cannot help you. A scientific study, founded by the members of this board, is currently ongoing, so there is hope for a better medical understandng of the cause of POIS.
There is a lot of valuable information on this forum, as well as suggestions of lifestyle changes and supplementations that can be of help in order to lower the severity and duration of the symptoms. You can find lists of useful treatment suggestions that have worked for others in threads like
http://poiscenter.com/forums/index.php?topic=75.0 ,
http://poiscenter.com/forums/index.php?topic=74.0 and
http://poiscenter.com/forums/index.php?topic=73.0. You may have to go slowly and safely, and may not find on the first try, as a specific supplement may help some and not others. There is no single vitamin or supplement known yet that is helping everyone. For example, niacin is good for many, but not all.
Some members have posted their own way to cope in individual posts, like I did at
http://poiscenter.com/forums/index.php?topic=2090.0 . These posts may be helpful for you too.
So take your time and search this forum, and ask questions if you want. At least, you now know that you are not alone in the world with this condition.
A psychologist may help you cope with this condition, but will not cure you. It will only help you with the emotional distress that POIS causes in our life and our relationships.
In the meantime, even if not always easy, abstaining from ejaculation or minimizing the frequency of it, until you have found something useful to help decrease your symptoms, is a good idea.
Take care,
Quantum