Hi Joe, congratulations! I'm so glad you are already feeling a bit better

The pain experienced after extensive removal like this isn't uncommon. It is indeed trauma to the teeth and someone I knew had it for many many months, but it gradually faded. Give your teeth a chance to settle and improve and avoid anything too hard to eat/chew on if you can.

As long as when you bite down, you do not get the sensation that your materials in the teeth are too high, it should feel normal. So if the dentist has made sure they're ok in that regard, it's probably just the trauma of all the drilling and if he's a thorough dentist, he would have drilled every bit of amalgam out.

So sensitivity/pain isn't uncommon. Composites can tend to be more sensitive also when first put in. May take sometime to settle and adjust.