Very strange BM patterns

Okay, well here it is. About two weeks ago I ate a sandwich from a fast food place and wound up getting fairly sick. I was throwing up and having upper abdomen pain. As the days passed the pain went further down my abdomen and i had to go back to work. I noticed that i had to use the bathroom a lot more and i had alot of gas and pressure. I took some gas chewable pills and this seemed to help with the bloating and pain. My fiance decided it would be a good idea to try an enema and i conceded due to the fact that i was in a lot of pain. After the enema i had a loose BM but the symptoms persisted. I had a drastic loss in appetite during this time. After about a week the symptoms seemed to be going away so i started to eat more food. At first salads and bits of grilled chicken when i could, then i moved onto some noodles and veggies. A few days ago i started my winter vacation from work for a few days and the bloating came back along with gas and strangely enough i feel like i have to have a BM every few minutes. When i try to go i get bad cramps and flatuance and the only thing to come out is kind of a foamy or slimy mucus. it is very uncomfortable and nothing seems to be helping. Im eating alot of yogurt in case its a bacteria thing but once again it doesnt seem to be helping. i have to return to work in a couple days and i dont know what to do. Ive been really stressed out lately and also ive noticed that my anus seems to be swollen a fair amount. it feels like there is blockage or something but once again i can sit on the toilet for an hour and i only pass gas and mucus comes out. Please help me!!