up to your neck
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up to (one's) neck (in something)
Extremely busy (with something); deeply or overly involved (in something); possessing, filled up with, or overwhelmed by an excessive amount (of something). There's no way I can take a vacation right now, I'm up to my neck in work at the moment! I only meant to be peripherally involved in David's business venture, but before I knew it I was in up to my neck! Dana was worried she wouldn't find any work as an accountant working for herself, but she's up to her neck in clients!
up to your neckINFORMAL
COMMON If someone is up to their neck in a bad situation, they are very deeply involved in it. He was, at the time, up to his neck in charges of corruption. The Prime Minister was up to his neck in scandal.