new pain, could the cancer of spread already?!

For your own peace of mind get it checked. It could be lots of things, including things that may be a nuisance but won't cause you grief. Your GP or oncologist. I got a shoulder pain checked out last year, because it was niggling. Nothing serious, easily fixed. No one thinks it's silly to do this. You have had enough to worry about, you don't need uncertainty. Best wishes