(Ask 10 times) Diet herbal medicine.. Will I gain weight again after stopping?

I tried to get help with medication because I couldn't lose the weight gained after having my second child. But after taking the medication, my heart pounded too much... and my whole body felt so weak, like a sick chicken. Even so, I was losing about 1 kilogram a day. The medication was effective, but the side effects were severe, so I couldn't continue taking it for more than a week. After experiencing this, I became afraid to take diet pills again. I noticed that many people around me have lost weight with herbal diet medicines, but there are also many who say they gained even more weight after stopping, due to the yo-yo effect. Now, I am doing exercise and dieting, but I hit a plateau and feel frustrated, so I am thinking about trying herbal medicine again. I want to try it for a short period... but if I stop after taking it, will the yo-yo effect be severe? Usually, how long do clinics recommend taking the medication?