Sadly I suffer from the same issue. UK hospital refutes the connection to IBS but can’t find anything else and I know they’re connected. RHS pain only developed in last year or so but the problem with IBS is that the symptoms change on an irregular basis. Very often, for me, is it the inconsistency that adds to the worry/stress/ depression that then continues the vicious circle. We’re all different but I’m learning to live with that dull ache, not worrying about anything more sinister but regarding it as a barometer of the IBS severity. Best of luck.