hi Avatar,
I don't have any personal experience with this stuff but my psychically gifted friend had problems some years ago (in her youth) after opening a "portal" on her bedroom ceiling which led to her being raped by an incubus during sleep paralysis.
You could consider yourself lucky not to be bothered by an entity as unfriendly as hers, and you could consider it a blessing that you may be psychically gifted.
Of course I do not know for sure, but it doesn't sound like schizophrenia to me. If you notice delusions within your waking life (which separate you completely and totally from even your open-minded friends) then you will want to seek medical help. Actual schizophrenic delusions become worse over time and the longer you wait to deal with them the harder it becomes to reassert "conventional reality."
For example my schizophrenic friend was diagnosed shortly after he decided that- "Everyone is Homosexual and any time someone coughs they are secretly hitting on each other."
You can tell this is a delusion because of the absolutism involved. Indeed some people are homosexual and sometimes coughing could have a secret meaning. Personally I cough due to smoking weed, not because I'm a faggot.
Anyway, I think you will be most happy if you are able to resolve your situation with this entity without the use of drugs. Indeed you might gain an ally or knowledge.
I should mention that my friend with sleep paralysis found that cannabis completely blocked it from happening. She no longer smokes cannabis and is fine today I believe. If you want me to ask her for more advice I will.
I am hesitant to recommend cannabis because it may just "cover up" the problem instead of ameliorating the root cause. But if you are at your wits end and on the verge of a nervous breakdown or financial ruin due to lack of sleep- cannabis might provide some temporary relief and rest. I would certainly try that before resorting to nasty "legal" medicines like Lithium.
But like I said the best solution will not come from a substance. Good luck!