yeast?

so i’ve had a yeast infection for maybe 2 weeks, went to the doctor about a year ago and they gave me 2 pills, one for the day i went to the doctor and one for a week later if needed. i took the pill, and i’m about to take the second one because the yeast infection is still going on. here’s the thing. in the past few days, my butthole has gotten UNBELIEVABLY itchy. can yeast infections spread there? also i’m constipated, could it just be that?