Squishy white lump on soft palate

Hi everybody. 

Looking for some advice please.

I have recently found a small white painless lump on my soft palate in the roof of the mouth (Towards the back) I am petrifired as I'm sure most people would be. 

I'm only 29 but I smoke drink quite a lot and also have HPV, i don't know if its connected but i have been getting very bad acid reflux and regurgitation recently which is very uncomfortable.

I have been to my dentist and he said he doesnt think it's anything bad but wanted to go to my gp. My gp has had a look and also doesnt think it's anything sinister. However has referred me to a specialist for a biopsy. 

My appointment is a week away but I'm constantly worrying about it being mouth cancer. 

Any advice would be very much appreciated and if anybody knows of anything else it could be. 

Thank you

Laura