Lynnmignon - this cramping is one the side effects I got with HRT in post meno - along with erratic bleeding - this is why I have given up on HRT. Whilst higher doses of progesterone may settle the bleeding a cramps it can bring more low mood and PMT type symptoms.
The only non bleed regime that worked for me OK, was having a Mirena fitted and then using oestrogen as gel or patch. After the first few weeks, the bleeding stopped and I seldom got cramps. The first few weeks can be a bit tough, while the body adjusts, but you do then get 4 years of relatively trouble free HRT benefits. The Mirena delivers the progesterone more directly to where it is needed with less absorbed systemically - hence fewer side effects. Some women find they can't even tolerate the Mirena as they are so sensitive to any progesterone but the Mirena is a favourite with many gynaes because it can settle erratic bleeding and even shrink fibroids and polyps. DG x