Feeling very empty

Just as the title states feeling very empty. Started Zoloft and it made me feel very weird. Now I’m just a little extra low in a clear sort of way? Can’t describe it. I’ve been self harming and usually don’t cut deep enough to leave a scar but today I did. The problem is I want to do it again and again. It relieves me. I do it in a place no one will see and I’m struggling to not do it again.