Sorry to sound harsh, but this is surgery, with small-medium but significant risks (including death - depending on how good your surgeon is). Have you considered getting a personal trainer? At a BMI of 37, its not that hard to lose weight, and a personal trainer can have you fit and looking good within a year or two. I found having someone/something to motivate me was all that i needed. Also, a personal trainer for a year is likely to be cheaper than surgery, and you will be healther in the long run.
Also, as a side note, I know BMI is not that good an indication of how "fat" someone is, its really the skin fold test. Anyway, i think if you start by eliminating all alcohol and pre-packaged foods from your diet, you might be surprised how effective it is. I know its hard. I had a BMI of 30 about 4 years ago. I didn't have any co-morbidities. I set myself a diet plan. 2 weetbix and milk for brekky. 1 medium apple and small tub of plain/natural yogurt (in one of those snap packs - try to find the one with the lowest sat fat and free sugar) for a snack. 2 sandwiches with wholemeal bread, tomato, lettuce, beetroot, 2 hardboiled eggs, gherkins/pickles and 2 thin slices of honey roasted ham with no butter (the key is no butter). One more apple for a snack. and whatever roast or Pasta (no cheese/olive oil/pesto etc.) for dinner.
The other key is 0.5 to 3/4 of an hour of solid exercise per day. This means sweating and pushing until you're breathless - this is where the personal trainer comes in. Do this, and you will lose a lot of weight within 6-8 months and be very fit. It will be easy to start, but a lot harder after the 1st week, and hard for at least 2 or 3 months to come, and during this time you will lose a lot of motivation. But push through and you will feel happy that you didn't do the surgery.
I don't like to say how much weight I lost (it was a lot) but that shouldn't be the main goal. I always told myself that If i become fit, the weight will come off by itself. Before i started, running 300 metres was a struggle. After half a year, i was running 3 kilometers non stop, an improvement of 10 fold. Last year, I ran the melbourne half marathon, and this year, I am playing in the glen iris open championships in tennis.
P.S. the food doesn't seem a lot, but eat it slowly, and you will realise that it is.