Rib pain

Which rib is this, one of the floating ones? The last few ribs at the bottom aren't attached to the breastbone like the others. The ribs aren't actually fixed onto the spine or breastbone, they have joints there like other movable joints in our bodies, and this is what allows our ribcage to expand when we breathe. Some people get a condition where one of those joints becomes inflamed and that can cause pain. There is no treatment other than time.

I think one of the clues here is that it is worse after sitting for a while in a bad position. This could be what is causing the problem. So there may not be an actual injury, it is just poor posture. There are muscles that run between each rib and poor posture can cause those muscles to go into spasm.

You could try improving your posture, getting up and moving about more often to relieve any muscle strain, and see if that improves things.

I wouldn't bother at this stage trying to see a different GP. If improving posture and exercise don't help, and it gets worse, then I would see the same GP again if you can so that they can see that things haven't got better and then they can suggest something else.

But give it a chance to recover after changing your posture and the way you are sitting first. Otherwise you will probably get the same treatment from another GP.

Good luck!