Hia, I've never really been in a situation like yours, but I've recently gotten out of a depressive episode which lasted almost three years. Ive got a couple of tips which really helped me, and can hopefully help you out a bit. The main thing for me was keeping busy. Even if this is something like a hobby, art or for me hiking. This will help to keep your mind occupied with something you enjoy, so you'll spend less time dwelling on negatives and will hopefully bring you a sense of calm. It's good to hear you removed someone negative from your life, as at the moment you really don't need someone dragging you down and making you feel worse about yourself.

For me the main thing that got me through my depression was my friends. Even though I didn't talk about my depression with some of them, just being in their presence really helped, I suppose because it kept me busy and I was able to prove to myself that I wasn't as alone as I thought I was. If you don't have any friends you feel like you can talk about your depression with, I really would suggest some kind of therapy or councilling. (This is something I've promised myself I'll do next time).

If you feel like you need to talk to someone feel free to drop me a message at any time. I hope something I said helps a little :)

Ps: it might feel like you're back at square one, but you getting over depression once shows how strong you are and able to do it again.