endoftether, the symptoms you describe sound like classic low oestrogen. It is difficult to get the dose right and took me a very long time.
I had a dreadful problem with a dodgy themostat and endless sweating when I was taking Angeliq (oral HRT with only 1mg oestrogen) and even when I topped it up with a 50mcg oestrogen patch, it still wasn't enough and I was still sweating buckets endlessly even though I didn't really feel that hot. I found it affected my core body temperature and although I didn't ever have night sweats or even feel particularly hot at night, I used to have panic attacks at night and feel as though I couldn't get enough air when I was lying in bed. I then discovered my blood oestrogen levels were way too low so no wonder I was having problems.
Very soon after I started on 3 pumps of Oestrogel everyday and a small bead of testosterone, the problem went away, it was almost like a miracle and I felt completely normal again! I have since dropped to 2 pumps everyday and didn't notice any difference so I have kept with that dose - it also means lighter periods but luckily that does not apply to you.
My advice would be to try 3 pumps of Oestrogel everyday to get a really good dose of oestrogen into your system and then you could drop down to 2 pumps and that may well be enough. You might want to try splitting the gel dose by 12 hours to keep your oestrogen levels constant - oestrogen dips could be part of your problem. If you find your PMDD flares up then you could immediately switch to 2 pumps of gel but it might be worth just trying 3 pumps because you might be surprised, it could work and you have nothing to lose by trying.
I learnt a vital lesson from my experience and that is knowing the difference between normal, acceptable sweating and abnormal, profuse sweating and poor temperature control caused by low oestrogen.