Sorry no one has replied to you yet. Yes, this is MBD and fairly bad case at that.
Did you get him to the vet yet? How did that go?
MBD can be stopped the the bone deformities will never go away.
What brand of ubv did you buy? Is it a long tube or a coiled up one? What are his temps and how are they measured?
Does he eat anything besides mealworms?