Question: I am on a diet – lost 30 lbs – bladder now overactive – pressure and urgent to use bathroom

I’m 19 years old with what seems to be Overactive Bladder. Back around October of last year I started dieting in order to lose weight, at the time I was around 170lbs and I now weigh around 140lbs. I did not do any exercise, instead I stuck to a very limited and strict food diet. I would only eat once a day and would work 11hours straight at work without eating. My hair did start to weaken and fall out more. I am now eating normally again and maintaining my weight safely. My question is, could my diet have caused my bladder to become overactive? I cannot drink anything other than water now & my bladder is so sensitive that even if I have just 2oz in my bladder I feel the pressure & urgency to use the bathroom.