Transmission/CV axle leakage?

I recently noticed transmission fluid leaking from where my axle went into my transmission. Then learned that when I changed my CV axle a year before that, the output shaft seal should have been changed at the same time as the axle, but it wasn't, and fluid then was seeping from there. So, I got a new seal and tried to change it getting the old out was easier than getting the new one back in, in fact it has taken me about 6 seals attempts before I got it in without damaging the seal itself and mind you the seeping became a steady flow of fluid coming out to a fast drip, now causing in the first and fifth attempts all the fluid came out after turning off the car to the last time where the transmission was empty. So, as I'm putting fluid in, my car starts squealing smoke coming from my dipstick and a puddle underneath my car. However, on my CV axle itself there's a metal cap that comes on my axle that fits onto the seal from outside the transmission that came off it the while putting on the last seal. Can this cause the leak and does the axle need replaced again now since that metal part came loose or does it sound like the worst news possible, and my transmissions just gone out. I've had this car about 2 1/2 years and been able to drive it maybe 8 months total due to one issue after another.