Sore private parts!

Ugh! I'm 20 weeks with twins, been feeling this for a long time already! But my vagina, (not the inside ) the outter lips and what not feel very very sore and or swollen! I've heard it's all the ligament pains and pubis dysfunction but damn! Not even wearing a maternity belt helps, nor Tylenol :( I can't really turn sides in bed, sit up to get off of my bed, or sit for too long with out this pain getting too intolerable! :( ugh just needed to vent! I'm taking any advice anyone has that could help me out! Thanks ladies!!