Hi welcome to Health care magic forum.
Thanks for calling H.C.M.Forum.
You had a hit on abdomen,You are getting pain after
masturbation. Sperm comes out during sleep, or pressurise for shitting, There is
belching , and loose motions as well.
It all depends upon the age, getting sperm in the sleep, (
nocturnal emission) oozing of sperm while defecation, pain after masturbation are all common in teen age group. Nothing to worry and no treatment needed.
Belching and occasional motions are to be considered, If you stop thinking of adult hood, you will be relieved of sperm problem and stomach problem as well.
If you are not relieved of the stomach disturbance consult a gastor enterologist for diagnosis an treatment. You may need to have gastroscopy besides other routine tests for confirmation.