I'm with HandWired, although the guys on here are very experienced with bass playing and I'm sure some might have experienced your type of symptoms, they/we are not doctors.
if your worried about it, your doctor is the person you should be talking to. no doubt.! soreness can be part of playing for long periods. like having sore fingers after playing. pain imo, isn't good, its your body's way of telling you what your doing is too much.
better to seek professional medical advise in my opinion. I'm pretty sure everyone else will say the same.