Hello Ness and welcome to the forum. What a terrible time you have had. I really am sorry for all you have been through.
First I just want to talk about the Vagifem and the dryness you are experiencing. This is known as vaginal atrophy and it is great you have vagifem. It will be helpful for you to get some vaginal moisturiser and use it as much as you need. Sylk and Yes are nice and gentle and both available on Amazon if you use that site. The vagifem should be used every single day no matter what you may have been told. If you apply some of the vaginal moisturiser to the applicator it will help with inserting.
Vagifem is great for the inside but does not really help much with your outer bits so if you ask for Ovestin this will help further. This is a cream rather then the pessary vagifem is. We have tons of threads on here about vaginal atrophy if you would like to read any more about it.

I have not had my ovaries removed but from what I have read, many women fall into a depression so I am not surprised you are feeling the way you do. You may be sensitive to progesterone. It is difficult to know with both oestrogen and progesterone to know which one can be causing the side effects you are experiencing.
This does not mean you cannot take HRT. There are still more options for you so please do not despair. I think it would help to be asked to be referred to an NHS menopause clinic as they will know more then your GP too.
Congratulations on getting married soon. It sounds exciting.
