Definitely take that snake to the vet; thats a huge weight loss in such a short period of time. I've had snakes not eat for months on strike that didn't loose that much weight.
Edit:
Paper towels are not causing the bad shed.
Right now the stuck shed is the last of your worries. You'll want to take that snake to a vet and find out what's wrong with it. Treat the snake, correct your husbandry, and next shed should go much better. Step one is to find out why your snake lost 100g in 2 weeks.