Hi Bonnie,
I'm sorry you are not feeling well. If you do have MS though, getting a cold or flu can make MS symptoms more prounounced, even set off a flare sometimes. I do hope you feel better soon. I saw you got hit pretty good with the snow, we got hit as well but not near as much as you did. You're doing the right thing though, stay inside and rest up.
Sorry to hear about your sister, I hope she didnt hurt herself when she fell? I hope things work out well for her, will you please let us know? And you are yourself as well.
Oh and to answer your question, no don't usually get sick by himself unless its like a sinus infection or something like that. He actually gets sick less than the rest of us, quite strange indeed. Take care.