Did you do all this by yourself? If so you have a long road to hoe.
Wholesale changes = wholesale trouble shooting that starts BEFORE you changed things up.
You will need to start from the beginning of EVERY single change you made and double/double/TRIPLE check each and every change you made for accuracy. Then you will need to do it all over again when it won't start. There is no easy out here.
If you had help, get whomever you did all this stuff with to get back under the hood with you and help figure it out. It could be anything. I gave myself the same headaches on a much smaller level and it took months to get it figured out by a pro.
Sorry to be such a Debbie Downer here, but this is what it is.
Perhaps someone will step in here with some magic wand fix, but I think you might just have a real shit storm on your hands.
I wish you best of luck.