zelda, that is a huge pity. Paradoxically, all the risks attached to HRT are in the synthetic component (high doses of synthetic progesterone in particular) and yet GPs often prescribe cheaper synthetic forms of HRT to women first and only prescribe the bio identical, transdermal forms of HRT if pushed. Admittedly they are very small risks but nonetheless, it doesn't make any sense and also, from my own personal experience, synthetic forms of HRT are much less effective.
By the way, I'm pleased you are back on HRT and hope you start to feel better very soon!