The valerate version is supposed to be "slower" to release into your system. 1mg of each is same but the valerate should take longer to process and for the body to use.
But I agree with the others, not sure why the doctor has pushed you back to the almost same HRT.
There is also the option of going to 3 month cycle with Tridestra.
See the following for the details:
http://www.menopausematters.co.uk/perimeno.phpThis may give you longer to build up enough to then have a normal period every 3 months.
I would like to have tried this route as my own cycle was nearing the year between
However doc thought it was not for me as they thought it was a post meno options
Imho, I think my doc reckoned that I'd give up the HRT as I'd have to go back to a monthly cycle too after having periods 6 months plus apart
Hope things get back to normal asap for you