I'm glad it has been useful, clock. :) BTW, if you do turn out to have hypermobility syndrome, this wouldn't rule out bursitis or a tight IT band, as other people suggest. In fact, it would explain how you might have injuries/conditions like these (which are normally reserved for athletes) despite not being very active: it is common for people with HMS to develop 'athletic'-type joint problems because their muscles work harder than normal to support unstable joints, their ligaments are tense, and their unstable joints are more prone to injury and inflammation. Potentially, just walking takes the same sort of toll on someone with HMS that running a race might do on someone with normal joints and soft tissues.
To add to the problem, people with HMS often lose fitness because they start to avoid exercise, because of the extra effort and pain involved. And with very low fitness levels, injury is even more likely. So for example, in my case, I have 'shin splints' ATM, just because I walked about 1km at the weekend - which is a problem athletes usually get if they do too much, run on hard surfaces or don't warm up properly.
If you have HMS, it is useful to know, because you can then understand what's going on and manage your condition better. It is common for people to avoid exercise and gain weight, which of course leads to further problems, and it is harder to lose again because it then hurts. It is common for people with undiagnosed HMS to assume - and have doctors and physios assume - that mobility problems are due to lack of exercise and being overweight, whereas in fact it is the other way round... If the condition is undiagnosed, people with HMS may start to do inappropriate exercise to try to tackle weight gain or poor fitness, and end up much worse. (This happened to me). It is really, really important to keep as active as possible - but you have to do the right sort of exercise: no impact and not too much bending - so swimming, Pilates, and running on a cross-trainer rather than running machine or normally... If your fitness levels are really good, you may then also be able to do other things, but you have to be fitter than average to avoid injury, iyswim.
Sorry, that's a bit of an essay! I'll stop. 
tattycat, I missed your good wishes earlier because I was skimming for clock's posts. Thank you. :) I'm glad your sister is doing well - that's reassuring. :)