The past 4 weeks, I have been experiencing some odd symptoms. It started out after I ate a lot of junk food. My stomach started to hurt really bad and my bowel movements changed. The doctor told me to use Milk of Magnesia to help. It didn't really help.

The doctor also said it could be pregnancy. I have taken numerous pregnancy tests and they all come out negative, plus I got my period on Dec. 5th.

The symptoms I experience are: stomach cramps/pain in my lower stomach, minor bloating, acid reflux like feeling, less bowel movements that consist of small stool, minor lower back pain.

What could it be that I am experiencing?