I have been under severe stress but all in all, I thought I was handling it pretty well. About two weeks ago, I started having diarrhea and it lasted for almost 48 hours. Then, constipation followed with bloating (although I still feel like I have to run to the bathroom for diarrhea). This has been going on for over two weeks now. My high middle back is hurting and my chest feels like something very heavy is sitting on it. I feel horrible. I can't work when I have diarrhea, and then I am so weak from it that I don't have any energy. Has anyone experienced anything like this? Could it be caused from nerves?