Selfish for being on Zoloft?

Hi ladies (and gents)!
I'm currently breastfeeding my almost 10 month old baby and have been prescribed Zoloft for my intense health anxiety. I am scared to take it because it's a relatively new drug and I don't want it to effect my baby. I don't want to give up breastfeeding because I love that bonding time with my child. What would you ladies do? I'm constantly checking myself and going to the dr for my anxiety and I don't want my baby to sense my anxiety. Please help! Would it be selfish to take Zoloft and still breastfeed?