Can you dream other people's dreams?
Do you think you may be recalling past lives in your dreams?
This looks like a good web site to learn about some of these things - simply put also. And of course there are many more. Just google or look up on Amazon.
As long as you continue to communicate with the entities they will bother you but I can understand your curiosity. Try turning your curiosity towards more positive areas of the astral plane. And, of course, unschooled you are inviting trouble.
While I do not doubt that you have negative entities around you my first thought was that you are being poisoned. If you have fibro I assume you are taking medication. My cousin really blew up like a balloon on her medication though she did not communicate any other problems. I cannot take manufactured medications. I try to find something natural or nothing. Check out your medications an request change or get off of them. I recently had a big problem with medication and my doctor never told me my health deteriotrating so fast was because of the medication. You probably will have to do it yourself.