Ya hate to say that it is MS for sure or not, but the terrible feeling that you recieved from the hot bath sure is similar to that of MS symptoms. Hillbumm is absolutely right about how they use to do a dx for MS using a hot bath...so simple but all so true. People with MS usually do not tolerate heat very well, whether it is from a bath, outside temperature, dressed to warmly, etc, etc. And when u become too warm, all of your symptoms pop to the surface..tingling, vision problems, heart palps, etc. And it does without a doubt bring on fatigue...
I said to my wife the other day, "gees dear, I have not had a bath in years"...she said to me, "do you have any idea how bad that sounds"....ha!!!
Gary