Medical advice required.

Can anyone with a medical background help with this problem.

Eight days ago my DH slipped on wet grass and fell into a 3ft deep trench at the bottom of our garden. In this (temporary) trench I had a large plastic planter which broke his fall but part of it snapped and caused a nasty gash and bruise on his RH side. The bruise is fading and the gash is healing well but he is experiencing extreme discomfort from an area on the same side about 2 or 3 inches below his lowest rib.

Being his usual stubborn self, is refusing to go to hospital to have it checked out but I am concerned he may have damaged an organ.