Suggest Treatment For Swollen Vaginal Lips

I am a 60 year old female with irritated swollen vaginal lips. I wear a lot of one piece bra and panty outfits and am wondering if it is pulling too tight on my bottom. I do wear pantiliners to soften the blow so to speak. But the problem usually last 2-3 weeks in duration. I've had these before. But what can I do in the meantime to survive the symptons? It's like an irritated gland in the lips themselves that just plain hurt. Any suggestions?