Bruce may have an abscessed tooth.however,his actions are more symtomatic of a cat that either licked someting diagreeable or has something stuck in his mouth.Check the cheek pockets and uder the tongue.
He may have ingested a thread,piece of carpet, goten a static electric shock or even have bitten his tongue.
when he ran, he was trying to escape from a painful issue.
See if he will drink a bit of milk or tuna water.
If he takes it, try canned cat food, boiled chicken or tuna.
A cats appetitite is the best barometor of his health because sick cats won't eat.
if he does, let him and then just keep an eye on him for a few hours.
Please let me know how he is doing.I wil always be here for both of you
I hope your baby will be fine.