I need the help of some t-5 experts

Hello,
Recently, like two days ago, my transmission started giving me some problems. I was sitting at a light and I felt a large thump(my radio was up LOUD) and saw my shifter shoot over to the right. I thought my tranny had grenaded, but it was still ok in first gear. After that it was VERY hard to get in and out of both first and second. I adjusted my clutch and it goes into gear fine now. Here is my problem. I have a BAD vibration under load, and it is even WORSE on decel. It only hits in first and second really noticebly, but on my drive home tonite I could feel it in 4th and 5th as well, third is still smooth. I think it is getting worse. The vibration only happens from idle to about 3500 rpm. If I am on it hard it feels like my motor is about to explode, but as soon as it hits 3500 rpm its really smooth like normal. If I am coasting with the car in first or second, and no pressure on the go pedal it is really bad, then If I push in the clutch the vibration totally goes away. Any idea on what this might be? Thanks

I thought about the balancer too, but since the vibration goes away when I push the clutch pedal in that thought pretty much exited my mind immedietally. Since I posted this the damn thing started grinding into 2nd and 3rd Anyway, I have a used t5 in storage with a broken input shaft, where is the best place to buy a rebuild kit and an input shaft... I will have to inspect the other gears as well since I have no recolection of what they looked like. Thanks for all of the help guys!!