Ugh... I'm sorry that it's so terrible. I have a couple thoughts, but none of them are really easy.

1. How long have you been there now? If it's been more than a year, could you renegotiate your pay? Just about everywhere I've worked, employees and contractors get evaluated for raises on an annual basis. You're doing more work than you (and they, I think?) anticipated. It might be time to raise your prices.

I get that you might not want to do this, since you want to disengage with this place. But, I wonder if doing that would help you feel more in control (even if just for a bit), feel more valued (by getting paid closer to what you're worth) and make it easier to build up your savings, so that you can get out of there?

2. I very much agree with Seesaw. I think that, in general, people (or companies) are willing to take (and demand) as much as they can get from us. It's in *their* best interests, right? And, until they bump up against a boundary from us... they're going to keep doing it. They might not even realize it's a problem (like, "Wow, isn't it great that Hvert is willing to put in all these extra hours! Look, I just found even more work to keep her busy!")

Boundaries are hard. Sometimes risky (i.e. you don't want to lose the job, and it feels like saying "no" might prompt them to find someone else who can say "yes") - but it's important to be clear about you can/will do versus what you can't/won't.

It sounds like the most helpful boundary for you might be to not work on days that you haven't already agreed to. Working 7 days a week is CRAZY, by the way. Nobody should have to endure that! We all need time off, away from the office, to be human and live life! It's a totally unfair thing for them to expect of you, but... it's your life... it's up to you to protect yourself (from exhaustion, burnout, overwork) by putting up that boundary and enforcing it.

3. I know, I've already told you this, but I really do think that you should present yourself as the "expert" and strongly suggest to them that they bring on at least one other IT person to help out. You can sell them on this - tell them it will give them constant coverage, it will help make sure they still have someone around when you're out of the office or on vacation, explain that the work they need done is more than one person can handle in the hours that you've agreed to work... (maybe more than one person can do full-time even?)...

Just some ideas... I think I've shared them all with you before, so apologies if it's repetitive!