I'm so sorry. Are you on any drugs? This sounds like it might be some sort of chemical reaction to me. Some chemicals affect some people's brain chemistry very adversely. If you started or stopped something recently, this could be caused by it. (If you withdrew too fast, for example, or if you're just having a toxic reaction to that drug introduced to your system.)

Just a thought. Otherwise, did something trigger this for you? You don't mention anything happening to cause the feelings. I hope you can get some kind of help for it as soon as possible. My thoughts are with you.