Stomach, Ulcers, Gastric Bypass Forum - Do I Have One of These Problems?

I have been having abdominal pain for the last 2 months or so. 4 years ago I had the similar problems and the doctor said I was full of crap. But I was going to the bathroom normal and everything went away once I take the magnesium citrate that she told me to take. I noticed that when ever I have a bowel movement that it looks like I have onion skin (the clear part)like things in the toilet. But my doctor then said nothing was wrong. The same thing happened again but this time when I went to the doctor they thought that it was my ovaries but they have ruled that out and my appendix was ruled out when I was in the hospital. The er doctor told me that there was something wrong with my large intestine but didnt say what. I have since gone to my doctor and she had me take the magnesium citrate and add more fiber to my diet but it doesnt seem to be doing anything. I mean I can go to the bathroom but never feel like it is finished. Sometime I can go for 3-4 days without having a movement and then start to hurt really bad from it. Sometimes I will get the runs and then have mushy stools but it always hurts when I do have them. It feels like razors or something and then it goes way. Sometimes I have to push my stool out so I wont hurt anymore. There are times that I will have really bad gas and have a very foul smell and my husband cant stand it. He tells me I smell worse then the dumpster outside the house. When I pass the gas again I get the razor feeling.
My stomach area starts hurting really bad when I work for more then 4-5 hours,(always walking around). I cant lift anything over and over because it starts hurting my stomach. When I think it is getting better and I can go to the bathroom normally I find out that I am not getting everything out because it starts hurting again. I havent had a period in over 3 months and not pregnat. Have low estrogen and an diabetic. Can you please help me out so I can get this problem fixed. Help me try to tell the doctor what I should have run because she isnt doing anything about it and I am missing alot of work from being ill and hurting all the time. Please help.