What would most likely happen if you took more than your supposed amount of vitamins?

when I say vitamins, I mean like, flintstone gummy bears and those hard ones in the shape of circus animals that give you a lot of vitamins. last night, I felt a slight cold coming on, I took 2 or 3 when I was really supposed to take one. I thought more vitamin C would help, and let's say it didn't. my cold is worse.