I recently lost a significant amount of weight and have a lot of loose skin what are my options?

I am 23 years old and am 5'10. I was 355 pounds. I lost the weight over the course of 3 years. For the past 8 months I have been unable to break 240 lbs. Since losing the weight my skin on my chest, legs and arms is pretty much just loose flabby skin. I believe this is the reason I have been unable to lose any more weight. I'm sure I could help the problem with strength training (which I have never done). But in all honesty, I'm somewhat lazy to stick to a regiment, especially for 2 reasons. The first being that I have read in some places that cosmetic surgery is the only way to eliminate all of the problem. Also, I'm concerned that strength training would take a very long time to notice any results, which would only lead me to become frustrated and give up. As far as surgery. What are the costs, risks, and success? Should I give strength training a shot? I would prefer anyone with credentials present them when answering. I'm not interested in listening to what typical Yahoo answer trolls have to say. I have seen some very unkind things said on these forums in the past