I just got off an antibiotic for a uti infection.....and i have this problem now!!!?

Okay first they precscribed me this one medicadition and it wasnt working so they put me on another it seemed to work....( i had to take the rest of the first one bec. it said to finish it) and the doct told me too also...well while taking both i experienced diareha....after i finished the first i was taking the 2nd still and still had diareha...okay im off both medications....(been off of them for 2 days now) and now i have this itch and burn all throughout my and my .....im not sure if it is a yeast infection or a allergic reaction....please help....