suzysunday - here are my thoughts:
They should test your urine again to be on the safe side - if there is an infection then this must be treated, however UTI type symptoms are common with urogenital atrophy. Your vaginal flora is probably off balance and you may well have bacterial vaginitis, which is very common after using antibiotics, so you need to get that whole area healthy again. The strange discharge (which could also be smelly) and the bladder irrational can all be aggravated by this bacteria. Bladder pressure and the constant need to pee is common with urogenital atrophy.
Definitely use the Ovestin again (although Vagifem would be better) and I assume you use some form of vaginal moisturiser? SYLK or the YES products are best (buy these online) but you mustn't use these at the same time as the oestrogen treatment or it can effect absorption. So oestrogen treatment at night and moisturisers in the morning and during the day.
To treat and prevent BV and thrush, I find Multi Gyn Actigel is brilliant - you can buy this online. This will restore the flora balance if used for a few days 2-3 times and day. I just put a good dollop on the end of my finger and push this up inside and around the outside 3 times a day for 5-6 days and I then use this a couple of times a week to maintain a healthy flora. I cannot understand why Multi Gyn Actigel is not prescribed by GPs as I think it is very effective and very safe to use.
Avoid caffeine, fruit juices and alcohol but drink lots of water. To neutralise the urine if you feel burning or UTI type symptoms I drink a glass of water with half a teaspoon of bicarb of soda morning and evening for 2-3 days ( I add a small amount of cordial to make this palatable).
Eat lots of veg and fibre but avoid too much sugar and eat live yogurt and things that improve the gut flora.
You also need to do some relaxation techniques to help calm your anxiety - I personally think anxiety fuels so many things - so be kind to yourself. DG x