Hello, thanks for the query to H.C.M.C.
? no way.
Physically you are fit that's a nice thing.
Pain around the buttocks and in pelvic region after belt you wore is somewhat tight.
Now please do one thing that this pain may relates to large intestine (colon
Please get an U/S of whole abdomen to rule out any involvement of large intestinal parts.
Lastly please consult a doctor for haemorrhoids and fissures as these two in early stage don't recognize easily.
Have a good day. Dr. HET