For clarification it's called PBA (pseudobulbar affect) and not PBS.
There's only one medication approved by the U.S. FDA specifically for the treatment of PBA which is Dextromethorphan hydrobromide and quinidine sulfate (brand name -Nuedexta). However antidepressants are also used to help reduce the frequency.

I'm taking Neudexta and it is seems to help!

I just enjoy it.

I was diagnosed in 2010 with MS ... The uncontrollable crying happened around 2012 ... Uncontrollable laughter started this month.... It scares me because I get to a point I can breathe but I still can't stop laughing and then the crying starts at the same time... I get very confused

May I asked when did this start ?