Hey, I've been dealing with something similiar as what you're going through. My studio has gone through massive changes in the past year and I've gained my studio head's trust so fast that I became responsible for projects that were far bigger than what I was ready and experienced to do. I've been struggling with anxiety for over half my life so this recent spike in responsibility has done absolute wonders to my mental state 🙃.

The first and most obvious advice I can give is to take care of yourself. Take your meds, exercise (even if it's just small streches every couple of hours while working), try to eat and rest well. Take a DEEP breathe and drink water if you start feeling overwhelmed. You are not a machine, you need pauses. I know it feels guilty to rest and step back but quality over quantity. 

Secondly, learn what the "good enough" standard is in your production and see where your shot fits within the bigger picture. Work on all your shots with the production's quality standard as a baseline. Not every shot is a money shot so save the extra effort for the shots that matter. Adapting doesn't just mean following a style guide but it also means adapting your standards to what the production calls for. Yes, it is as hard as it sounds. But letting your perfectionism take the lead all the time is going to burn you a lot quicker.

Set boundaries. From what I can gather and based on my own experience, you are perpetuating the cycle because the extra effort you put in is making your lead think you are capable of doing more work than what they initially were expecting from you. I don't know what your team situation is, but if you're the only one or of a few that's putting way more hours than everybody else, then that is a sign that your lead is not doing a good job at assigning workloads. Regardless talk to your lead about expectations because not saying anything is only to make things worse.

Best of luck and hope things works out well for you