Lip biopsy worth it? 😭

I'm kind of scared to do it because what if I undergo the pain, scarring, possible damage... just for it to be inconclusive :(

My symptoms aren't severe. I have chronic dryness mainly of my nose/sinus and my eyes for about 5 years.

My test are fine. I don't have any swollen glands. My blood tests were clear of anti bodies and my general blood work was also ok.

I'm worried to waste my time and literally lose a chunk of flesh and get a little traumatized/scarred for nothing.... especially because my symptoms are "relatively" mild although chronic and very annoying. I use eye drops and nose sprays and humidifiers every day. I am not in horrible pain or a strong case, but like I said it's there and it's annoying.

Also my mouth isn't that dry, so I am worried they won't even find anything in my lips.

Help please?