Sean,
I hope things get sorted with the thyroid.
I have been on several different pain killers / anti inflammotories over 14 years (shoulder injury). I've been on the naproxen (approx 7 years) and diclofenac approx 6 - 12 months - my Dr's refused to allow me to have another prescription. I did try Voltarol but that made me very ill!
Turmeric was recommended as an anti-inflam, you can get it in health shops, I've been on that for around 4 - 6 months now, I have been in a bit of pain recently so I've increased my doseage from the minimum of 1 to a maximum of 3 per day until this eases up. However, I would also suggest that you ask a Dr if it's safe to take with the drugs your on for the thyroid in case of complications.
As others on the thread have said, you've got to shout at the Dr's, unless you do that I'm afraid you'll be at the end of the queue and forgotten about. I didn't shout at mine enough, I got annoyed and got referred to a specialist by work's Dr; he told me in no uncertain terms that I needed a shoulder operation immediately to repair damage.
Fair play with your attitude on someone else is always worse off - that was mine too, but I can sympathise (as many others here will too) if your unable to run etc.