Hair loss at 17? HELLLLLPPPP?

Today, while brushing my hair in the morning I noticed multiple strands falling out of my fault. I felt irritation and applied olive oil, assuming I had dandruff. Once, I had finished showering clumps of hair fell on the floor, which really worried me. I did rupture my appendix in January, and no operation has ensued due to scar tissue and abscesses in my stomach. I was on heavy medications, like Cipro and haven't had any pain-killers for about 3 weeks. Is this just a side effect or should I get checked by a doctor? Thanksss.