Your situation is eerily similar to mine.
I, too, am working on a cardiac tele floor with a ratio of 4:1.
I'm sick with depression and anxiety, and loathe going to work every single day. The other RNs make it look so easy, and CNAs do nothing to help.
I'm drowning in sadness. I don't have a solution for you or myself...but just know you aren't alone and we will find a way out of this. Enjoy your new job next year and keep your head up.