How long did it take for your HCG to return to 0

I had a D&C on Thursday. I took a hpt today and there were still 2 lines. My HCG level the day before my D&C was 2200. How long does it take to go back to negative? I'm not looking to TTC for the next few months as this was my second miscarriage this summer, but I'm ready for this to be 100% over.

Separate question- I'm toying with the idea of starting back up on an antidepressant. No, I'm not crying during the day. I'm "fine" during the day. I can rationalize the crap out of our 2 losses. I struggle at night. My mind wont turn off and I struggle to fall asleep. I can literally be so tired but won't drift off. I'm not about taking unnecessary meds and we will want to TTC maybe in November or December. My husband thinks I should wait a little longer before trying meds and maybe talk to a therapist. But I'm not a talk about my feelings kinda person. I've known about this miscarriage for a month although the D&C just happened Thursday. It's been a month of awful sleep. I'm tired. What do you think? I need advice.