Q: Car went backwards when I had it in drive.

This is a known issue in the Volkswagon Jetta transmission. Converter drain back is a situation where the automatic transmission fluid drains back into the transmission pan causing this kind of a reaction. Some of this is normal, but not to the extent you are describing. Another potential problem could be hardening of what are called clutch piston seals. These are rubber material and when they get cold they tend to harden which causes them to leak. This can also cause the clutch to be slow or erratic in being applied. I would suggest having an certified expert, like one from YourMechanic, come to your home to diagnose your rough driving symptoms firsthand and make the necessary repairs.