Need help for Burnout!

I 27F, moved to Osaka last year and been working for a Japanese company. I recently have found myself really becoming helpless while communicating and feel like my Japanese is getting worse. I also have been making a lot of mistakes in documentations and stuff (all of which are in Japanese). I also think it is affecting my productivity and confidence and to make it worse I have been getting almost no sleep recently because I am trying my best to understand messages, reference documents and try my best to get something done.
When I ask a question to my colleagues, it's usually "what are you trying to ask?" or "have you read some other documents".
I blame myself for not improving my Japanese proficiency before starting to work in Japan.
Did anyone go through a similar experience? How did you handle it?

by EnmaAi_98