Hello, I don't know of a natural remedy, but you don't need to be fearful of the surgery. Who told you it is very painful? I had labial reduction surgery about 12 years ago. It was a short outpatient surgery (I was able to go home soon after that same day). It was not that painful as I recall. My only issue was that the antibiotics I took afterward caused a yeast infection, for which my doctor perscribed diflucan. But you can take natural things to prevent this, which I didn't at the time. I am so glad I had it done, as I was so uncomfortable for many years before (since hitting puberty). Best wishes to you and hope it goes well.
Labia Minora Surgery
I had the surgery years ago. It wasn't that painful. Nothing like childbirth anyway. I am glad I did it.