Hi Abi~! I had the same problem last year and couldn't draw properly over 8 months... I still sometimes get the same feeling but I can tell you how I overcame it. It might not work for you but you can give it a try or I don't know come up with a similar solution that fits you.
So I have an Instagram account where I'd been posting my art over 6 years now. My followers increased over time and I got comments/critiques from everyone. Literally everyone. I love getting them and I appreciate it, but I realized the ones I get from close friends/family affected me the most. Comments like; 'you should stop drawing characters and draw... more landscapes', or, 'why are you drawing guys all the time I think you should draw more females' and 'why do you always do the same thing, you should try other mediums'... were the ones that got into me. So I just stopped drawing instead of ignoring them. Plus I had some real-life issues, that stressed me out. I didn't realize that I was stressing so much over everything that I had stopped doing the one thing I love.
I thought it was a short artblock at first but it continued for so long I was frustrated. I also thought I wasn't improving and anything I drew was so bad I didn't even have the energy to finish one piece. But when I looked back to my old art, I realized I actually improved so much more than I imagined.
So I decided to go back to the start. I found myself an empty sketchbook. I set up a new account and started posting my sketches -not finished pieces- that I randomly did. I used references 98% of the time to make my work easier. And slowly -it's been 4-5 months now- I got over the block.
I don't know how much this helps, but I hope you can get solve it~!!
