Portland,
A tonsillectomy and biopsies of your tongue and throat proved to be negative. All this done by "qualified ENT's". That's the most definitive way to detect cancer. You had surgery a couple of weeks ago. All tests came back negative. The back of tongue area takes a long while to heal. There are chunks of flesh gone from there because of the biopsies. You're still healing!
I concur with Christine. My goodness man! Be happy you don't have cancer! Perhaps speaking with someone about your health anxiety about cancer would be prudent at this point.
Positive thoughts and prayers.
"T"