Hello Mrs. Ericksen, Guillain-Barre and M.S. do have something in common, they're both autoimmune disease, meaning a person's immune system attacking the person's normal cells, and they're both attacking nerves. The difference is that in M.S. the central nerve system is attacked, which means the brain and spine are attacked. On the contrary, in Guillain-Barre the peripheral nerve system is attacked, so people would feel tingling, itching, etc. M.S. is much more serious than Guillain-Barre, Guillain-Barre causing death is actually very rare.
Mrs. Ericksen, since you've said the nursing home isn't sanitary enough, I'd suggest you to wash your hands thoroughly with cleanser or soap several times a day, after getting up, before meals, after meals, before sleep. Try to go outside and get sun light for a couple of hours every day. Try to walk and keep active every day. Eat fruits and vegetables every day. These won't make you look healthier right away, but help boost your immune so you have a lower chance of getting infection in the long run.
Wish you all the best.