I'm sorry you are in such a hard place right now. I'm also sorry to have to tell you that you're the only person who can decide if this is right for you. You can talk to your doctor, your friends and family, and people on forums like this one, and that infomation can be helpful, but when it comes right down to it, your the one that must decide. I suggest that you think through what the worst case scenario would be if you had the surgery, and your husband left. Could you manage? Do you have family nearby to help with the children? For me, the first month was tough, but not devestating. I returned to work (at a sedentary job) ten days after surgery, but everyone is different. What is the worst case scenario if you don't have the surgery? How is your health? Do you have weight-related health issues? If so, they will probably get worse as you age. Maybe by weighing these two sides of the issue out, you can make the best decision.
As far as hair loss goes, I too, had lost a good bit of hair before the surgery, due to genetics, I think. I am 62, much older than you. I have lost hair since the surgery. It is getting pretty thin, and I may have to go to a wig. I've done some investigating, and wigs are much better than they used to be. At this point, (almost 4 months post-op), I have lost 60 lbs. and feel wonderful and have more energy than I did 20 years ago! My blood pressure is normal, and I have been able to discontinue several medications. I do not regret my decision in the least.
I hope this helps. I will send some prayers your way.