I think this is much more serious than stuck shed. I had a snake that developed a systemic infection (hers was due to an immunodeficiency) and it looked very much like what I see in your photos. The pockets she developed were filled with pinkish fluid that was very high in white blood cell count due to the infection. Note the red area towards the snake's belly in this photo: http://img90.imageshack.us/img90/1467/img1447il9.jpg. My snake had the exact same redness from the infection which spread and became darker and brighter red quite rapidly.

I would recommend that you call your vet first thing in the morning and explain to them that this is an emergency and see if they will see you ASAP. Systemic infections are deadly serious and if that's what this is the snake will likely not make it until Tuesday, and if it does the stress of the vet trip and treatment may be too much for it.