No you aren't alone feeling this way at all... When your spouse (brother, father, sister, really anyone you care about) changes THEIR gender identity, it really changes YOUR identity too.... You used to be a straight woman, married to a man, well, now you're leading a lesbian relationship... sometimes its a pretty big pill to swollow...
I've sorta skirted away from this board the past few months, some because I've just been plain busy, but also because I'm trying to iron everything out in my head, and I know my significant other reads the posts here, and I don't want her to feel bad.
But I DO know how you feel about jealosy, I'm a plump size 24-26, and shes a slender 14... with a small belly.... but she feels -fat-.. and she tells me so fairly constantly... and I outweigh her by over 100 lbs... so yeah, theres some jealosy there...
Unfortunetly, -most- women are really competitive with each other, I've never personally understood it, Most of the time, my jealosy is kept in check, It only really pops out when its really thrust out there... (Such as her complaining about her weight and size, when I'm quite a bit bigger.)
The whole thing is an evolving -process-... For me it was a learning process on SO many levels... I never wore makeup myself... the first time I used it, I was using it on my "husband".... that was weird...

Just a note, I want to reply to
Molly- The key to coming out to your wife, is just be honest with her, tell her sooner rather then later, the biggest regret (Really the only regret) I have with Jaycie's transition is she didn't tell me sooner... It DID take me a long time to become 100% comfortable, and I asked a thousand questions, including "are you SURE you aren't gay??!" about 75 times.... I was REALLY afraid I'd lose her to a man... She was patient, answered everything, a million times... assured me she loved me and isn't, and has never been attracted to men, that isn't an issue, and slowly it became ok... my brain started to wrap around the idea and it was easier to understand.... But give her time... she WILL need it.... and be availible if she needs to talk, or vent, or ask questions...

and good luck!