2000 Infiniti G20 Help-Bad Vibration

Shakes or Wobbles problem
2000 Infiniti G20 4 cyl Four Wheel Drive Automatic

I never had any problems with my car, I only replaced the battery since purchase.

I had a slight vibration at first, but nothing like this. I went in to have my cv joints and I put a motor mount on because I was advised. The motor mount was installed on the passenger side. Now my car shakes really bad in the morning (first start up), in reverse. I also notice when driving. It feels heavy, lke things are sliding and when I go over bumps it feels like things are shaking. Should I change the transmission mount to balance. Help so confused, these parts are expensive.