Prescribed Clindamyacin for skin infection - worried

While at the walk-in clinic yesterday, I wasn't thinking about much else besides my skin infection on my hands and face that are raw, hurting, and constantly discharging yellow liquid (has no smell though?). On July 12th, I was prescribed 500mg Cephlexin, taken 4 times a day for 7 days. I've had breakouts like this twice before in the last 3 years (basically disgusting itchy rashes on my skin that seem systemic and discharge, making doing anything besides stay in my room be agony). So the walk-in doctor agreed to get me a referral to a Dermatologist (in Vancouver, so it will likely take a while to go through). He also prescribed 500mg Clindamyacin to be taken 3 times a day for 7 days. Although he briefly mentioned the possible gut bacteria problem related to CLindamyacin, I didn't think about it yestrday afternoon, but now I'm really worried about it, as I had intestinal issues a few years ago (cramps, diarrhea, constipation). While those symptoms aren't as bad now, I feel concerned for not mentioning this, considering that this antibiotic is related to a possible gut bacterial infection. I went to doctors relating to my intenstional problems when they were really painful, but they were different walk-ins, so this Doctor didn't have the medical records.

TLDR: Had intestional problems in past, worried about CLindamyacin's worst possible side effect. Should I go visit a Pharmacist/Doctor today to figure this out, or am I still likely safe/have to take all of them (took 3).