I'm your height and weighed as much as you do when I had my surgeries. Plus I am a woman. I asked my surgeon if weighing as much as I did was going to be a problem and he smiled and said no. He then joked about how he could loose some weight too - he's not that heavy. I had my take down 8 weeks after my first surgery. I lost 85 lbs subsequently, in around a year. I wasn't hungry and when I ate it hurt. My Internist and husband were concerned with my rapid weight loss but I wasn't worried. I had more weight I could loose. While it wasn't gastric by-pass surgery I figured I wasn't loosing weight as fast as people do that have that surgery. I've gained some weight back but not that much. My first surgery was 11/2/10 and take down was 12/29/10 so at this time 4 years ago I was in-between the surgeries. I'm grateful I don't have to live through that again. I was very ill.
I'd asked my Internist about having some kind of gastric surgery sometime before my j-pouch surgeries. She said that no one would touch me. Now that's depressing!
I hope your surgery goes well. It's difficult when you have other health problems. I don't know what your other problems are and hope they don't end up delaying your surgery. I'm assuming you have had your colon removed already. If you have then you have made it through the worst surgery, in my opinion.
Take care