First off, wait for final results. I know more than one person (including my wife) that had a scare like this and it turned out to be benign. It really doesn't have to be cancer.
Second, if you do get bad news, don't change anything. Be honest with your employer, and go on with your life. At your age, chances are you'll be able to continue working through the treatment and long after that. It's unlikely that your company's premiums will go up, but that shouldn't concern you.
Third, if you do get bad news, ask the doctor for a professional to talk to. At your age, you need some guidance and perspective from someone you trust.
Second, if you do get bad news, don't change anything. Be honest with your employer, and go on with your life. At your age, chances are you'll be able to continue working through the treatment and long after that. It's unlikely that your company's premiums will go up, but that shouldn't concern you.
Third, if you do get bad news, ask the doctor for a professional to talk to. At your age, you need some guidance and perspective from someone you trust.