problems down there

So these past couple nights (only in the night for some reason??) I've experienced like down there be super itchy and uncomfortable. There isn't too much pain but it keeps happening. I keep it clean , I'm not on my period , I've changed my underwear, I don't have any under lying issues ? Helppp!! This has never happened to me before ( other than these last couple nights) 🙁 I'm so scared