Before Tuesday, did he have any UVB?
MBD symptoms typically include twitching, jerky movements, seizures, swollen body parts, bumps on the back and tail, and loss of appetite. Do you notice any other symptoms? If he did not have a UVB before Tuesday, then MBD is very, very likely the cause. Now that he has the bulb, he should recover. If it persists, he'll need to see a vet for supplements such as liquid calcium. Is his appetite ok?