I had all 28 radiation treatments for rectal cancer. I thought the last week and the week after radiation were the worst.
Many patients have to stop radiation due to all the side effects. Sometimes they just take a break and then start up again and sometimes they stop all together.
My side effects from the radiation lasted over a month after the treatments were completed and it doesn't sound like I was as severe as you were. I do however, have a new appreciation for the phrase, Pain in the A$$.
The pain is very real. Do not be afraid to ask for pain medications, ointments or anything else you feel will help you feel better. I also ate a low residue diet to avoid having bulk stools to make it a little easier to go.
When the symptoms improve, you will have to discuss with your radiation oncologist if it's best to stop treatments all together or to finish up where you left off.
Good luck to you and I totally feel your pain. Hang in there.