(Concern) Long-term use of diet pills

I wasn't initially interested in herbal medicine dieting. My mother, who was overweight and putting strain on her knees, decided to try herbal medicine for her diet. At first, out of curiosity, I tried a couple of doses just to taste it. But I found that the appetite-suppressing effect was incredible. Even without eating, my energy surged, and I kept relying on it. So the problem is, I've been taking herbal medicine for several years now, and I'm worried whether it's okay to take it for such a long time...ㅠㅜ But I'm afraid to stop because I'm already dependent on it to the point of addiction...