"I have a huge problem," groaned Alex, digging through his backpack. "I haven't got my wallet anywhere in here! Do you have five dollars I can borrow for the bus?"

have is used with "I/you/we/they". We do not use the continuous form ("am having") for possession.

haven't got is the correct negative form of "have got". "Don't got" is grammatically incorrect in standard English.

Do you have is the correct question form for "have". (If using "have got", the question would be "Have you got?").