KT57 - you haven't told us how old you are? If it's 9 years since you had the hysterectomy, then you have been oestrogen deprived for a long time and it's going to take some time for the body to ‘wake up' and adjust. Starting on 2 pumps per day was probably not the best idea since you will be starting from such a low oestrogen base line. Why not use one pump per day for 2-4 weeks and see how that goes - this dose may be enough to keep you ticking over nicely. Just increase to 2 pumps per day if you feel you need to.
The white discharge will be you poor urogenital area waking up and producing some proper lubrication - it could be a bit of bacteria or thrush that can be treated with some Multi Gyn Actigel. Once meno hits we get very prone to vaginal infections.
Buy some Multi Gyn Actigel (buy this online) to use occasionally to help keep the flora balance right.
You would probably benefit from Vagifem local oestrogen as well, so perhaps ask the GP for that. Many of us use vaginal moisturisers daily to keep everything comfortable and healthy around our ‘lady bits'. - SYLK or the YES products are best and these can be bought online.
Keep going - I bet in about 4-6 weeks you'll feel much better. Dg x