TCM issue. “Please help”

I have a 2009 Pontiac g5. Car has 237,000 miles, car has ran good the whole time I’ve own it. I cut the Small catalytic converter off the car. It sat on jacks for two days and the battery ended up dying. I charged the battery enough to start the car and when I went to drive it I had no speedometer, wouldn’t shift out of first gear, then when it did it was a hard slamming shift, power was next to nothing. Power steering light has come on twice. I did everything I’ve heard about doing. I ran a ground wire from Tcm to the strut ground, cleaned every fuse possible, checked all my plugs, and connectors, and the car still won’t run correctly. What do i do? Someone please help me