Poor lil' guy. He probably has hookworms and two that I cannot name right off the top of my head. They are blood suckers, and if the infestation is big enough, the snake(or any animal) can become anemic. I'm not sure if one deworming is going to get rid of them all, because when any new rats or other animals I have had have needed deworming, I did it everyday for a good solid week(or if it is coccidia, everyday for 3 weeks is needed).

I really don't see what the need for tubing him is. If you just open his mouth slightly with a ruler or other flat object such as a credit card, then you can slip the wormer in that way. Tubing is for horses back in the 70's when they needed such copious amounts of dewormer to get rid of any parasite(I'm talking gallons...). With such a small snake, the dewormer is going to be less than 1-1.5cc's. But still, panacur only gives them diarrhea which may or may not flush the parasites out. See if he can use Strongid(pyrantel pamoate) instead, which affects the parasite directly through their nervous system(I think? Darned Equine class, LoL). You can go to the feed store and get a good dewormer, but I wouldn't think you would be comfortable deworming the snake by yourself(especially if the boyfriend doesn't want anything to do with him)

And yes, no feeding for at least a few weeks. The regurgitation as well as the deworming is going to kill off any beneficial bacteria in the digestive system. Letting the snake recover for 3 weeks or so without food will help build up the good stuff, and let him heal. Just keep him well hydrated and leave him completely alone. You can use the pedialite to give him electrolytes and other nutrients which will help keep him hydrated as well. But if he is drinking enough water, then it shouldn't be a problem, it's just the pedialite may help him through this process a little quicker(the glucose, electrolytes, etc). Keeping him nice and warm will help greatly in the healing process.

I hope he does well for you, and let us know how everything goes.