I know what you mean, mine comes and goes also and now it's back. I am going thru menopause, in december I had an ovary removed and i was feeling so much better and latelyi started feeling some pain and discomfort, bloating. I saw my doctor he ran bloodwk and I have some anemia and since I am not menstruating since december doctor wants me to get colonosopy. Well here comes health anxiety and I have been a mess since friday. As it is I am hormonally unbalanced because of menopause and now the anxiety of the what ifs and having colonoscopy. I am having a very difficult time and its affecting my daily life.