Yes as the others have said take a deep breath. If the 28% came from “Dr Google”, you should know that % is if he was diagnosed with Stage IV where the cancer has spread to bone(s). That doesn’t sound like your situation.
PNI invasion does not classify you as Stage IV (I saw you put it in all caps).
Still crummy news, to be sure, but there are guys who are initially diagnosed with psa’s in the hundreds, or even greater than 1000, and their initial symptom is they think they twisted their back.
So hang in there and carefully listen to your team. You will get up to speed on all of the terminology soon enough.