Clutch and?

Make: Honda
Model: civic
Year: 1997 dx sedan 5speed.
Approx. Miles: 34k
Engine: 1999 b16a2 (swap)

When everything was fine, the car accelerated fast and sounded a little loud (after market exhaust) which was normal. Then when I turned it on, the car seemed to lag a little bit (not accelerate as fast) and it also seemed a lot quieter (is the lack of noise a possible problem?). As I shifted through the gears I could also hear a low rattling noise somewhere near the right passenger side. After a day or two, I started the car (i left it in 1st gear) and tried shifting it to neutral. But it wouldn't budge. I then turned it off, shifted through the gears and it did it fine. I turned it back on (in neutral this time) and tried shifting it to reverse and it still wouldn't budge and u can hear a grinding sound. I turned it off and left it parked on the driveway for about 3 days. When I tried it again the clutch pedal was "dead" (when pushed in, it wouldn't come back up) but if I pushed it in hard enough the car still turned on and I still couldn't shift through the gears (had it in neutral and tried shifting 2 reverse). Do I need to have the clutch replaced and bleed the lines? Any suggestions/help? Much appreciated!