Re: I'm not sure what this is, any ideas?
It sounds like it could be hypermobility syndrome. It is usually genetic and causes laxity in the ligaments.
I can't speak to the second part of your post, but I can share that as I've gotten older I've developed some issues with individual joints over time.
Have you been to see an orthopedic specialist yet?
Asthma, Allergies, severe LPR/GERD, TMJD, Hearing Loss, Ulnar Impaction Syndrome, Shoulder Impingement, Plantar Fasciitis, DeQuervains, Hypermobility, possible Ehlers Danlos Syndrome