@Tink87 honestly, same, lol. In five years I've technically had four jobs (but I don't count the first one because they didn't pay me, which I think is a fine reason to leave a job), and the one I took at the beginning of this summer already has me ready to jump ship. So, I get it; there are probably a lot of us who can. It sucks not feeling like you've found your work home, dreading going to work every day, and seeing no way to deal except to find something new - again.
I don't know about you, but I'm finding that I *always* hate my jobs at the beginning, but months down the road I usually feel differently. Is it possible that what you really hate is being a novice? If not, what is it specifically about your current job that makes you dislike it - and what about the cath lab makes you think it will suit you better? I think good, honest, and thorough answers to these questions will help you make a better decision about your next steps.
The poster viprn21 gave some great advice about figuring out what you need from a job and only taking jobs that will accomplish that. For me, I want opportunities to learn and progress from novice to mentor in a certain specialty, a great team dynamic, a sense of purpose, and good work-life balance. The thing is, it actually helps to look back at the jobs I was at for a couple years and really evaluate what was good and not so good about them to make this list. Otherwise it's easy to get into a pattern of feeling like you just always choose terrible jobs, rather than giving yourself time to get comfortable in positions you picked for a reason.
Another thing that put it in perspective for me was someone's comment on one of my posts several weeks ago. A lot of nurses, myself for sure, derive much of our identity and fulfillment from our work. And we have every reason to be proud of being nurses! But even when you're in a position that isn't hitting the spot, it's important to feel anchored in something outside of work too, which makes it a little easier to handle a boring, unfulfilling, or just plain bad job for a little while - at least long enough to limit the lines on your resume.
I'm being a total hypocrite right now, lol, and like I said, I can completely sympathize; it's not easy to live your life when such a significant part of it feels miserable. Only you can figure out the best thing to do and how you will be happiest in the long run. I think it's just important to give yourself a break from finding the perfect job and take the time to figure out exactly what that is before making another move. Whatever you decide to do right now, I wish you the best!