Baloo,
You scared me for a minute!
I thought you were gonna say that you bought Britney Spears' new album, LOL.
Just kidding. Anyway, I totally feel your pain. Even though I stretch every morning, if I do anything-even push myself a little over my limit, I pay for it the next day. At least you have pain meds.
But, I really do hope you feel beter. If you won't get sick, maybe you should take some anti-inflammatories (ibuprofen). That way the inflammation will go down and maybe the pain will go away. Just some unwarranted advice form a complete stranger.
Also, I don't know what meds you are on, but I do know that some of them can actually cause some muscle twitches. Or, this could be a bigger issue. My advice? (I know you are thinking, MORE advice?
LOL). Seriously, my advice would be to talk to your doctor or rheumy. Good Luck!