First off; You actually staying on the job in med/surg for well over a year. That's quite an accomplishment. You've got your "one year of nursing" under your belt which makes you a better candidate for jobs going forward. I have several friends that went through 3-4 jobs their first year because they just couldn't stand it.
I worked one for about 3 months and then quit and went somewhere else where I stayed for about 5 years.
When I feel overwhelmed I remind myself that nurses who work 12 hour shifts only work 12 days a month compared with 20 hours for the general public.
You can give yourself lots of time off without taking vacation days by working early in the week, one week, and late in the week the next week.
That said, there are hundreds of jobs in nursing that are not 12 hours, you do not have to work at the bedside. Perhaps do a little research into other nursing jobs, maybe try a couple of other nursing positions. Worst case scenario, you can support yourself working as a nurse while you pursue education in another field.
In retrospect, I think I would have gone into the military, be a nun, or law enforcement. But as I've been working for over 45 years now, it's a little late for me to switch. Interestingly enough, I went into nursing for the money and job security, quite sure I would hate it, and instead ended up loving it with all my heart.