Welcome @kaye4c, I've struggled most of my life with weight and can definitely understand your frustration gaining the weight back. I haven't had weight loss surgery but have found that intermittent fasting and low carb healthy fat eating has helped me keep the weight off. There is another discussion that you may find helpful --- Low-carb healthy fat living. Intermittent fasting. What’s your why?: https://connect.mayoclinic.org/discussion/low-carb-healthy-fat-living-intermittent-fasting-whats-your-why/.

I also found this article that you might helpful - How to Keep the Weight Off After Bariatric Surgery: https://health.clevelandclinic.org/how-to-keep-the-weight-off-after-bariatric-surgery/.

@grandmar may have some suggestions or thought to share with you also. Have you discussed your weight gain with your doctor to see if they may have some suggestions?