Sorry that is happening to you. Since I am not a doctor or medical professional I am not qualified or able to be helpful. Perhaps this is not related to what is happening to you, but I experienced the same kinds of things you describe when I was on Nyquil. I think I read somewhere that it contains some pretty powerful medicines that are able to cross the blood/brain barrier.

I hope you are able to see a physician, get a medical workup and find out what is causing your symptoms. There really is no substitute for a medical check with a licensed physician. Your health is too important to be left in the hands of non-professionals.