Really bad vulval burning

hi im was wondering if anyone could help me, since 2018 ive been having really bad burning on just the left side of my vaginal opening like it really burns the only thing that stops it is when i use ice pack down there and sometimes lidocaine but have to use alot of, ive been too my gp so many times they have done every swab you can think of and they have no clue what it is after two years of doing the same test they finally sent me to a gyno, they did the same test my GP did and found nothing so with that they sent me away with dermal cream, anyway fast forward a year I’m still having the same problems so i contacted my gyno and he wants to do a biopsy, im am now so scared i have cancer and its been left 5 years without being found, i suffer really bad with health anxiety to and i know that wont help but im so scared i dont know what else it could be so im convincing myself thats what i have im so worried. so any help or advice if any ones had the same symptom’s as me would really be helpful so i can go forward in getting a diagnosis, thank you its really appreciated.