Hi, I am new around here, but can relate to what you say in your post. I am exploring all the theory stuff around why I feel like I do and at times that can be reassuring and I can feel more in control and chilled. But then this thing descends on me and I feel totally engulfed and squashed by it - like I am bound up by it and can't get through it. It is a really scarey thing that takes over and it is so much more difficult to be rational at those times and I feel unsafe.
Then it clears and it is like "Wow what was that?" and I can breath again and function....until the next time.
I know when I am rational that these things do pass and I just need to stay safe and wait, but I find that so much more difficult when the monster descends.
But I guess we have to hang on to those more rational times and have faith that the bad times will become fewer, the more we stay in touch with others and talk about how we are feeling.
Take care - Soup