I got one a couple of weeks ago, not long after going back on immunosuppressants so had to come off them and have blood tests and such. It felt very swollen as well and the doctor said it was red raw. I developed a horrible cold a few days later. It's been rife around work and germs just circulating.
Went back on the tablets Monday then my throat was sore again (argh!) but hit the covonia throat sweets and it's calmed down again, just hoping I've not got the cold germs again!