Hey there, justmom!
Good for you for working to get healthy! The gym sessions sound really good. I'm not so sure about the gastric bypass--how have you tried to lose weight in the past? Maybe you just need a good program you can follow.
You'll find lots of information here on ways to lose weight, and lots of folks who know what it's like. The important thing is to find something that works for YOU, because we are all different.
Good luck!
Jay