Dotty - the HRT is working, it's just going to take some time for your body to recover. You have started from a very low base and there are no quick fixes. So often we hear from ladies, posting on this site, that it's taken 3-6 months before the benefits of HRT really did it's magic. The flushes are better already, the palpations are better - if the HRT does nothing else, then that's great.
Energy and strength will return but you have now got to use some discipline to eat well, go out for short walks and get more active. Do something social - meet with friends, join a club or do something that takes you out of yourself. Taking proactive measures will bring good things to you - you just have to be open. You have already started doing this by posting on this site - just apply this to more aspects of your life.
So many of us, including me, have felt the way you do now - it can and does get better but it's down to you to make this happen - HRT can't fix it all. DG x