Premarin and Ethynil are nasty, but they are nevertheless extremely potent - much moreso than the bio-identicals favoured these days. I'm also on 17B/Spiro/Finasteride, and my feelings echo Amanda's. Of course, my sex drive went away over a year ago, having started Spiro by itself back then.
In all honesty, I was expecting a stronger impact on my emotional state than the HRT has had. Granted, it is still very early, but I had expected WILD emotional swings. Instead, there's just this ... looser, more contented, more connected feeling that is awesome. I can cry for the first time since puberty, and even sad things that cause me to burst into tears are to be savoured. I can echo what Wing Walker said in another thread a while ago - They will pry my oestrogen from my cold, dead fingers.