Hi Bluebell59
Sorry to hear about your symptoms and also that you've been given beta-blockers for what may well be hormonally induced palpitations! From what I've read this seems to happen a lot!
In your position and especially as you've had a hysterectomy I would definitely consider oestrogen replacement (as well as Vagifem) which should cure the sweats, palpitations, exhaustion and a host of other symptoms - and you are lucky that you will not need progestogen as this is the bit of HRT which usually causes problems for some women.
In the meantime - re the sweats - it's so long since I had them ( I've been on HRT for over 8 years) - but I remember how debilitating they were and the lack of sleep was wearing. I am sure others have ideas but someone suggested a fan at night as well as nightwear of certain material but can't remember what exactly (or nothing!).
In the meantime read up as much as you can about it all...
Hurdity x