UPDATE: The vet and several of you confirmed that what I found were almost certainly two (giant) sperm plugs. Karma now has a much more modest set of bulges at the base of his tail.

Hopefully getting rid of those monsters gave some relief. He ate several silkworms on his own this morning (YAY!). He has also calmed down, and is much less reactive to handling, so no more biting. He took his slippery elm extract (O.3 cc @3x/day) well this morning, as well as some water from a pipet. I'm feeling better about his chances to survive this ordeal, but still keeping fingers crossed. I did leave a few soft cricket nymphs in the feeder station last night, and most are gone. I'm assuming eaten. I posted a couple pictures I took just a few minutes ago. Thanks everyone for all the help and good wishes. I'll continue updating.