It's hard to tell if this was a delayed reaction or a muscle spasm. It's always the best thing to contact a doctor and see if he finds the reason for the problems. I know that there are muscle relaxants on the market, e.g. there is an online shop for Flexeril but you should check before if this is t...

I think it's not really good. No problem for me since I don't like sodas and usually drink water. I would stay away from it or at least I wouldn't consume big amounts of it. Have you tried fruit juices? They taste good and are healthy.

Jogging is always a good option, maybe you can do some classic exercises on a mat. There is always something you can do, even on vacation or in the office, I also do some workout in the lunch break in the office.