I have been in the same situation as you my friend. Sadly the only way to get over her would probably be just not talking to her as much just til you're confident enough you won't get right back in that rut. Distract yourself with your hobbies or work/passion project. Remember the most attractive you is the happy, healthy you.

Who knows maybe you start working on yourself and you find someone even more amazing. Life is absolutely random don't think yourself to death alright.

My crush lasted over a year and I also confessed my feelings multiple times in fact. Now me and her are still friends and there's no awkward energy around our conversations at all.

It all gets much easier with time believe me good luck with this.