Hi Jane,
Welcome. I'm sorry you are stressing about this. From what I read in your post, I don't think you need to worry about MS. There are lots and lots of simple things that could be causing your symptoms, including stress like you said. If they are causing you discomfort, then I would get them checked out, but it sounds like you might be obsessing a bit. Perhaps you should take a step back and do something to get your mind off of your body for awhile and see if things get into balance.
By the way, MS is not hereditary, but there can be a genetic predisposition. Really, I wouldn't worry about MS unless you have a lot more presenting symptoms than a tingling foot.
Best wishes!

Julie