help?

okay so i’ve noticed that my vagina tends to dry up a lot for like a week and it starts itching a lot and it happens after every period. i start feeling symptoms around the last day. generally the last day is light enough to wear more regular stuff, not feel shitty or gross and not bleed through but heavy enough that i still need a pad. and since it’s not a lot of blood that comes out i think the pad gives me a rash or something and i don’t know why. i’m not sure if i have a yeast infection or if this is normal