I Recently Had A Hysterectomy (Dec 16). Since Then, At

I recently had a hysterectomy (Dec 16). Since then, at least once a week, I have sudden and severe stomach cramps. Pain with the cramps is even worse than the pain after waking up from surgery. It comes on quickly and without any warning. It is usually accompanied with what I call "sulfur burps". Those last at least a day and the pain can last for a day or two. The pain is in my upper abdomen and feels like it's also in my back. When the pain begins to subsides, I usually end up having very runny bowel movements.