is it unlikely to get underweight after sleeve gas. op.? how to counter back the weight loss without getting back again?

After being on a yoyo hype for the last 6 years, one time i lost weight and bounced back for a top record that i didnt reach before, 101kg. im 171 cm tall, i had my sleeve op. and now im 62.2kgs. Im worried about being underweight now, and im not into sweets at all. Is there is anything going wrong?.. i do not work out, and i do eat everything i crave.. still i do lose weight. I do take my multi Vitamins everyday. im worried to go to the gym and lose more weight.

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