Hi, My Symptoms Started A Week Ago. I Had A

Hi, my symptoms started a week ago. I had a migraine last Sunday and ended up in bed all day. Monday I still had it so again another day in bed. Monday evening I finally felt well enough to eat something. I got a bowl of raisin bran. Shortly after eating I got severe stomach pain. It felt like I had swallowed razor blades. The pain lasted quite a while, but gradually became a dull ache. Each day since, when I eat it is followed by pain. I have cut back to eating once a day. I have only tried plain rice, toast, or scrambled eggs. I'm afraid to try anything else. This evening I had a bowel movement that was bright red mucus. Any advice?