I have IBS-D. Yesterday I had diarrhea and stupidly ate junk food last night, pizza and a cookie, not what I normally do. I started having pain on my left side about 1- 2" below my waist. It will stop and start again. I have no temperature at all but am worried. Is it usual to have a gnawing pain in just one spot? Does it last for a whole day for anyone here, or more? I also have a lot of gas and am under stress now.