I has similar fears when I began my journey. I wish you well. I had my sleeve in December. I have lost 76 pounds so far. I feel great but worry all the time if it will stay off. I've gone from a 22 to a 14. I still have a way to go.
I've been at a stall for over a month. I went on vacation last week an lost 5 pounds then this week nothing! I don't get it! I am active at home more so than vacation. At home I jog 20 miles a week!