Abdominal pain with masses on the intestine can happen for the reasons above like a tumor or a growth. In your case, the doctor removed several tumors, which made the operation more complicated. It is important to put your trust in your doctor in such cases to improve your health. It may take time for the recovery to happen, but if you adhere to their post-operative care instructions, you will have the best results.

After a hysterectomy, sitting is merely the time to facilitate your recovery. Do not proceed with the bend-over technique – use your legs to squat and rise. Pick sturdy chairs with high backs and armrests. Avoid the heavy lifting, forcing pain and take regular breaks. Talk to your doctor for customized recovery plan with particular recommendations as to the proper posture. Pay attention to your body and try focusing on gentle motions along with relaxation.

After a hysterectomy, especially initially, be gentle with your movements. Before sitting, ensure you have adequate support, such as handrails or a nearby sink or counter to assist you. Keep your movements slow and controlled. 

This could be a case of surgical site infection. Usually, this happens after surgery where there is an incision made thereby causing redness as well as swelling around where you were cut. It might help if you keep that place dry after cleaning it every once in a while but try not to touch too much or else there might be more pain. Make sure to visit your doctor so they can figure out what else needs to be done about this.