Today I felt like I sprained my thumbs, why? (Details inside)

I tried to open a bottle today and it felt as if I sprained my thumb on my left hand, not by doing the opening but like it had been sprained already and I aggravated it.
It was fine before I went to bed. I did nothing that I know of during the time after I went to bed but when I tried to use it, it felt like it was hurt.
A short time later, favoring my left hand, I tried to grabbed a liter bottle of coke with my right hand and when I spread my fingers wide to wrap the bottle the muscles on the right hand felt like I had sprained them. Again, I had done nothing beforehand to damage them.
Right now when I spread my fingers there is a twinge in the big muscles that connect the thumb to the hand. What gives? Am I suffering some kind of vitamin deficiency or what?