I have the same type of symptoms at the start of a relapse into what I call an episode. I shake, and have warm flashes. I can’t sleep and when I do my unconscious mind startles me to sit up and I feel uncontrollable fear. I am afraid to leave the apartment. It is exhausting and I feel like my legs and body are lead. The only thing that helps in a muscle relaxer, so I believe it is definitely anxiety. However, I also cannot eat so my state is exaggerated by lack of nutrition. Then the depression sets in… It is the same procedure every time it hits. The strength of the episode depends on the stressors. I really understand, it is confusing and scary… I am learning to not let my stressors get so bad that I snap, and then my recovery time is shorter. Unfortunately I didn’t listen to my body this episode and although it wasn’t as strong as the last one, I am just coming out after 5 months of not being able to work. It is so frustrating. I welcome you to the forum and hope it helps you the way it has helped me.