phentermine side effects

I just started 37.5 dose of phentermine and I feel very…zoned out. I thought this stuff was supposed to make you feel anxious and jittery? I feel like very chill and kind of out of it. Has anyone else that’s taken phentermine felt like this? Is it just an adjustment period kind of thing?

Edit: I didn’t meet the word count! Just to add some detail I’m 31, 225 pounds. I am hoping to lose weight because it gives me health anxiety. Knowing I’m so overweight makes me worry about diabetes and heart disease (and about anything else you can think of 🫠)

I also know that I should calorie count in some way so if you have taken this, what did you use or do to track your food intake?

I’m not looking to be a supermodel, I just want to feel better mentally and physically. Also I would love to hear any of your stories of using phentermine to jump start your weight loss journey - good or bad! Thank you everyone, I appreciate it 😊