I've had constant UTIs through my whole pregnancy, and I was also given antibiotics to treat them. I also ended up with multiple yeast infections from the antibiotics killing off the good bacteria in the vagina, so basically what I would do is take a shower or go wash the outer vaginal area with warm water and the white dove bar soap since it's unscented, dry it, then apply some cortisone anti itching cream just on the outer part, then I would put in an ovule of Monistat 3 over night and go to sleep with it inside so it wouldn't come out. I know some people say to use the 7 day treatment but I feel like that one is not as strong, so I use the 3 day... they also have a 1 day treatment but I've had that's too harsh and just makes things worse. The monistat kits also come with a cream for itchiness outside on the vaginal lips etc. but those never worked for me, they just made me even more itchier. Good luck and I hope this helps you! I know how you feel cuz I've experienced many of these annoying infections!
Ugh I have a uti and my antibiotics gave me a yi as well.. The itchiness does suck I wish I knew how to get rid of it!
I know with monistat 7 you can put the cream inside for the infection and some on the outside to relieve itching