Cna test & test anxiety

Okay so I have my cna skills exam in 10 days AGAIN I failed the first time in the skills part cause I simply forgot to wash my hands I know dumb move I was so nervous I was missing stupid stuff & I have really bad testanxiety. As I get older it seems it gets worst . I get really nervous can't sleep for days bite all my nails off I'm extremely bad at it ... Does anybody have any suggestions? I have always been a bad test taker I can know the material but put a test in front of me I completely bomb it & the skills part your actually performing it so its nerve wrecking. I'm super worried I'm going to fail this test again. I take deep breaths & everything before any test it never works. Sometimes it's so bad I find myself getting up multiple if times in the middle of the test just to go take a few deep breaths! I'm really trying to become a RN but climb the ladder first CNA , LPN then RN but I feel so dumb that I can't even pass the skills part of CNA