Take a hiatus. That's normal so you don't have to worry much about it.
If you need help, we're all here: For everyone who is having depression
I went on hiatus for the last 2 years due to depression and life happened, and I just came back last month. Everything is fine to be honest. You can see how long I had gone by looking at the release day of each episode in my project 'Random Life'.
After hiatus, I came back and start publishing my new project 'DarkBleeder' that I was working on while hibernated. I scrapped 80 pages, a full chapter, and have to publishing a new chapter right now because It isn't good enough to be published.
You have to feel okay and strong to be able to bear the uncomfortable, unhappy, and under-pressured.
You have to feel okay at being a failure before you can do thing right.
You need to have a comfort zone, before getting out of it.
If you can't handle it, you shouldn't do it and shouldn't care about it either.
But if want to, you have to try harder to handle it by the best as you can.
You can't lower the level of difficulty by ignore it.
So do your best to grind your level but feel free to take a break. 
(P/s: why do I feel like I'm becoming a depression hotline... lol)