It sounds like you mean your vulva is itchy, not your vagina? Your vagina is the hole gong into your body. Your inner and outer lips are part of your vulva. Is that what is itchy?
It sounds like you might have gotten an allergic reaction. Try a different brand of panty liners. Make sure your underwear is clean, well rinsed out and no fabric softener was used on it.
Do not wear panties when it is safe todo so. Especially when you sleep. Once this is gone, you can start again.
Make sure you wear cotton panties, no tight, warm pants or nylons.
Wash only with lukewarm water and your fingers. No soaps or douche.
What does the discharge look like? (color, smell, thickness, stretchy?) Why were you wearing panty liners every day?
Enjoy your vacation!