What Should I Take To Reduce Cramping Of Calf Muscles?

HI, I have pnuemonia and I haven't been able to keep anything except for like 2 pieces of toast a day down. I don't feel sick until about an hour AFTER I eat whatever I eat for some reason. I have near cramping in both of my calf muscles because of I haven't been eating, I think. I have been drinking more than 64 oz. of water a day, so it's not from dehydration. What can I do to stop the near cramping? It's so uncomfortable, and it stresses me out. Is there any drinks that you may suggest to help me get some nutrients? Thank you!

~Rachn,m.el