I'm burned out, unhappy, and don't know what to do

I’m feeling lost, confused, and burned out in life right now. I [28M] finished my masters degree two years ago and got a job at a bank as a data scientist. I’ve been promoted twice in the last year and now manage my own team of data scientists. I make very good money but am not happy and have a lot of life decisions coming up. I’m currently remote but my bank recently mandated a 5 day a week RTO. The city I live in is out of scope for the RTO Q1 wave in January, but it’s likely I’ll be required to come back by Q2/Q3. I currently live about 1-1.5 hours one way from the office. 

My girlfriend [25F] and I have been living together for 3 years, dating for 4.5. We currently only live on my income. She has been studying for the MCAT for about a year and a half and has taken it twice now. She’s applying to medical schools all over the country. Our lease for our townhome ends after this upcoming February. I’m unsure whether she will get into medical schools this cycle or next cycle but need to make a decision soon to resign our lease or whether we should be ready to move. I'm afraid that if I move this February, I'll be out of a job with my current company due to the mandate.

With my banks recent RTO, this has made the situation a lot more muddy… Especially since I was under the impression I would be able to move where ever since my job is remote. However, I make a lot of money in my current role and if I stay in this management role - it’ll drastically increase my career trajectory with how young I am. 

I’ve been working long hours since I moved into this role - about 9-12 hour days M-F. It’s been taking a toll on me physically, mentally, and has been impacting my personal life. When we get to the weekend, we have to do our weekly cleaning, grocery shopping, and any other errands we couldn’t do during the week. I work long days, we go to the gym, eat dinner, rinse wash and repeat until the weekend. Between work and trying to live a healthy life to balance it out, I’m flat out exhausted all the time. My girlfriend says that I’m stressed and tired all the time and don’t want to do anything when we get to the weekend. 

With the recent RTO mandate by my bank, I also have the added stress of trying to look for another remote role that pays well. Between all of my responsibilities, I’m feeling a lot of pressure to work very hard in my career so I can provide and support for my girlfriend while she follows her dreams of becoming a doctor. I also don’t want to lose myself and lose my health in the process though. The weight of everything has been negatively impacting me outside of work and my relationship.

I’m lost and don’t know what to do.