Amen to what Brian said! Your story sounds so similar to mine. I have lost 100 pounds+ many times over the course of my life only to lose motivation, have an injury or setback and it has always resulted in a weight gain that was higher than my previous high point. It was a terrible, never ending cycle that ate me to the core and that I honestly feel, no I KNOW, that I have now broken with Weight Loss Surgery. I'm not going to sugar coat the experience and there have been struggles from time to time but I always manage to get back on my pony and ride. I am 13 months post op and about 17 months since I've started this journey and it is amazing. I think I actually saw my abs in the mirror this morning which is a BIG deal for someone that was once 506.6 pounds!
Good Luck tomorrow, take it easy the first month to get used to your new tool and then buckle up for the ride of your life. Its most definitely worth the trip.
Don't forget to check in on Sunday Mornings even if you don't post a weight!!