Water seems to come out of my vagina like bucket loads after i get fingered :(?

Ok guys this is a little embarassing,so please be nice & considerate with your responses,& if not simply just dont answer. I get fingered regularly by my boyfriend,but recently every time I do, i seem to leak water not just a little but absoloute bucket loads,even he finds it strange and to be honest i find it embarassing its almost as if ive wet myself,but obviously i havent.few months back pain started to occur in my kidneys towards the back,i have been to the doctors many times& all they have offered me is Nurofurantoin,i think thats how you spell it!anyways they hsve offered me large doses as the first dose did not work.but i still have the pain.i havent gone back to visit the doctor ever since and have tried to ignore the water leakage every time,but now ever since my boyfriend of 2 years broke up with me yesterday ive become interested in knowing what the problem is, has anyone ever experienced something similar? Prefebaly a nurse or a doctor could answer this for me much appreciated Thank You,5 star rating offered for a good,helpful detailed answer!