I had a bulging disc on L5 with degenerative disc disease elsewhere and it was unbelievably painful. Chronic pain was the worst until I had a discectomy. The area is still weak but I know the signs now and take care. Of course sitting for long periods is NOT a good thing - HELLO! I'm a quilter - duh! They were going to try me on therapy too but that was not an option (I waited too long to go to the doc).
Yes, therapy is painful but if it helps loosen those muscles, strengthens your frame, it can make you feel better. I also got acupuncture and that was awesome.
When mine acts up, I stick an ice pack down my shorts (sounds awful but ice helps me better than heat)
Hope you feel better soon and good luck to your son too.