Not trying to be harsh, its all been said already. Fold preflop.
That being said, lets look at somethings you said since you didn't fold.
I had been playing very tight and picking up nice pots
So far so good.
I am on the button and there is a raise to 2.00, 3 people call. I am holding 3s 7s and decide to make the call
See the last statement about very tight.

5 people to the flop and my dream comes true, 4d 5d 6h.
You have bad dreams, this is a nightmare and you already know why. Start dreaming of 3d 3c 7h when holding that hand.
He min raises me to 20.
Nope, Check raises you to 20
This is strange because he has rarely raised throughout the whole game.
Alarm bells should go off here.

Just some points to ponder, especially live when you have time, one table to watch, and you've been playing with them before. You'll figure it out. Keep asking questions, it's been really helping me to do the same thing