Hi JackieS - if you really like evorel conti and found it worked without side effects, there are some pharmacies online who have it in stock and will accept an NHS prescriptions at usual cost. You say you've been prescribed 100 estraderm patches, if you were only using 1 of the evorel conti patches that's only a 50 dose and so the new patch would be double your old dose. You'd probably feel unwell doubling your dose so unless your doc told you to cut the new patches in half, you should check with him/her that they meant you to be on that higher dose.
When they said you need additional hormones they mean a progestin which stops the womb lining from building up and causing problem bleeding. Did they say what they would give you in terms of progestin?
In terms of your mood, it's probably because you've stopped the hrt and your having what's called progesterone withdrawal symptoms, also known as pms, the same as you would have before a period when younger. You may get a bleed but it's unlikely to be much if at all as you were using a conti hrt which keeps the womb lining thin and bleed free, be prepared but it shouldn't be much if it does appear. If you decide to stay off hrt you won't have any more bleeds as you're now post menopausal. If you did have any unusual bleeding without hrt, further down the line, it's always important to get it checked out by your doc.
Hope that helps and let us know what you decide.