Hopefully they gave you clear instructions on how to not spread this to your family members? It's very, very contagious.
I've had lots of elderly relatives with c.dif and they all recovered despite having other health issues. It is serious but people who are otherwise healthy tend to recover. A treatment that really worked for my husband's grandmother, who was 94 when she had a really fierce bout of this, was IV immunoglobin (IVIG) treatments. Another newer treatment is fecal transplant, where they colonize your colon with healthy fecal matter from a donor- sounds unappealing, I know, but it's supposed to work really well without the nasty side effects of the antibiotics.
Make sure that you're on a clinical strength pro-biotic during all of this. I forget what my GMIL was on but it was something only available by prescription, not the kind you pick up at the store yourself. That can really help to offset the side effects of your new antibiotics and lessen the chances of recurrence.
Hopefully this will be short-lived and you'll feel better soon!