I changed to decaf tea a few years ago and drink as many cups as a like now.
I think the constant urge to go is probably because of the weak bladder walls due to the loss of oestrogen, this also caused my prolapse. It took a while but after using vagifem for a year the prolapse improved to the point I no longer notice it and I don't feel like I need the loo every five minutes, or go at night now. After 4 years I still need to take it everyday for atrophy but thats due to sitting all day at work, I can reduce the amount when on holiday.
I also suffered a prolapse after my third baby, I was only 28 but sometimes breastfeeding can cause depletion of oestrogen and a few months after stopping breast feeding everything went back to normal.