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I’m not a doctor but I can definitely tell you that the golf ball sensation you describe can be cause by a hernia. I have had one for years and the inguinal hernia surgery remedied that issue. In the mornings when fresh out of bed I could lean on one leg on the side of the hernia and feel the golf ball prominently but less so or totally absent when leaning on the other leg. As the day progressed the golf ball feeling became dispersed and seemed to be more in the middle. The same results can be had at any time of the day after a rest in a laying position. Incidentally, if you lean forward while standing the golf ball is much less felt. So I can confirm that that sensation can be caused by a hernia.