Take it one day at a time! It's not easy at all, and I do hope you feel better!
As everyone suggested, drawing your ocs is a wonderful start. No need to jump right into the hot pan just yet, get yourself warmed up and have fun! : D~! Creative jucies flow when we are feeling good, so take your time and just start with small sketches. Not even fully rendered stuff, just random doodles of your characters and have fun with it! Maybe a personal sketchbook would help so it feels more for you and only for your eyes!
I hope you make a quick recovery and that you keep creating dude! YOU GOT THIS ദ്ദി ˉ͈̀꒳ˉ͈́ )✧