Go to the Doctor and make sure your hormone levels are normal and get checked out for any other problems that may be effecting your weight. How are you feeling otherwise? Any issues like feeling tired or stressed or depressed? Any insomnia or other sleeping problems like sleep apnea? Could you have picked up a bug while overseas? The weight gain could also be caused by kidney disease or a parasite that effects kidneys or your heart. You could also be dealing with Type 2 diabetes, whereas in the early stages a person gains a lot of weight before it starts dropping rapidly.
Once you've ruled out a medical explanation, your doctor should have some good advice as how to proceed. But definately get to the Doctor! Since you stated that you have a history of obesity, I'd look at the type 2 diabetes first and rule out that possibility.
Good luck and I hope you feel better soon

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