I delt with something similar come to find out its our soap that is causing my bottom and vag to itch like crazy so i used baby diaper rash cream and it went right away
This happened to me. It's just not so breathable. I watered down apple cider vinegar (2 tlbspn to a quart of water) and rinsed myself in the bath with it. Very soothing and it balances the ph of your vagina. I'm much better after that!
I've had that problem before. I was using cotton ones that irritated my lady parts and made me have a reaction. So I switched to the foam like ones and it went away.
If the pantyliners are scente u might have a reaction