Congrats on your being able to quit smoking! Especially by quitting cold turkey!!! Please do your best to remain tobacco free. Unfortunately even a light smoker faces a higher risk of getting all kinds of things.

Try to stay busy so you do not panic. You dont know what is wrong yet so getting upset wont help. It will only make you feel much worse about your situation. It could be any number of different things which are not serious. I hope you get in to see an ENT in the near future. make sure that your ENT is familiar with treating oral cancer patients so they will be able to do a biopsy if your sore looks suspicious. After the biopsy it will take about a week to get the results.
Diagnosis info from the main OCF pages

Here is a gallery of lesions. Cick on each photo and then on the diagnosis. Im sure you will be surprised by some of the photos. Some of them I was sure were cancer but they turned out to be something else. This will help you to understand how many other things could be going on inside your mouth.
OCF Photo Gallery

Sorry but I am not familiar with how common it is for HPV to spread from one region to another. Even if you would be HPV+ it doesnt mean whats going on in your mouth has anything to do with that. Only a small percentage of HPV+ patients end up having cancer related to HPV.
Main OCF pages, HPV info