Will thus require rewiring.

Hi guys. I decided to install a dimmers in my kitchen and living room. The one in the kitchen initially went just fine, put it in like the instructions said, it worked perfectly. Then I went to install one in my living room, and this is where the problems started... I wired the 3 way dimmer into an electric box in the living room, which is a 2 gang box with a single pole switch next to it which controls a fan. The light itself that I hooked the dimmer to is on the fan, but controlled by separate switch. Anyways, I put in the dimmer, but when I tried to actually push it in the box, I could not because physically box is too full of wires. I went through and cut a bunch of the wires shorter to make more room, and reconnected all of them same as before. I turned the power on to test, and sure enough, everything was working, dimmer in living room worked, kitchen lights, everything fine. Then comes the weird part... I pushed the dimmer into the box, and then the lights in the kitchen turned off, and also the light in living room. This was from me physically pushing dimmer into box, so of course, my first thought is , I must have loosened a connection in there, but since then, I've gone back and checked every connection in there and they are all tight, but lights wont come back on now. I went through my house and looked for a tripped GFI, and found none, I also checked the circuit breakers of course. I have also noticed that the lights in the foyer dont work now either. Any ideas?