I used dettol liquid mixed with water to wash my vagina. now it burns when i pee. how long does this last and what can i do?

Stop douching: This is terrible stuff to put in the vagina! It has irritated the tissues and probably is the cause of the urinary pain. It should clear up in a day or two, but see your doctor if it does not. You should never douche (vaginal wash) with anything; it is unhealthy and unnecessary for hygiene. If you have odor, discharge, or otherwise thinkg you have an infection, see your doctor, but never douche!