Q.Transplanting shock
I have several houseplants that I have repotted. Some are losing leaves like crazy. Will this stop or have I killed the plant?

Here are some articles that will give you ideas on how to treat the transplant shock your plants are experiencing:
Repotting Stress: What To Do For Repot Stress Of Container Plants
https://www.gardeningknowhow.com/houseplants/hpgen/repotting-stress-treatment.htm
Learn How To Avoid And Repair Transplant Shock In Plants
https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm

check to make sure the soil is completely covering the roots with no air pockets