Would you risk taking Valtrex (for cold sores) if you tend to get D?

Here's my situation:

- I tend to get cold sores, on my nose of all places and another started today.
- My ENT doctor wrote me a generic script for Valtrex (yes the pricey oral med for cold sores).
- I read online that D can be a common side effect to Valtrex.
- Given my history (part of my colon removed, chronic multiple bm's, tendency to have D unless I eat plain food, etc.), would you risk it and take this medication?
- I can always just topically treat the sore with Abbreva and swab the skin with Q tips dipped in peroxide (what I usually do but I've never tried Abbreva).

Thanks so much! I need to decide if I should even fill this prescription. My gut is telling me not to risk it. I have an important social event tomorrow and of course I do work part time now. I just don't want full blown D to erupt while away from home.

*Edit* I'm leary of taking this powerful medication but will wait in hopes someone replies. Been reading side effects online and it's scary! I have a few hours to decide.

I used to get cold sore on the side of my mouth and it was scabbing over. . But taking antiviral drugs like HSV-Zero can help manage my condition. It prevents the sores if used before they form, and dramatically reduces healing time if used once they are appear.