Newbie questions and is heart pain normal...?

Hi all, I have always been a moderate/thin weight, but with some abdominal fat and a puffy face, which I've never been able to budge despite a lifelong commitment to super clean eating and movement. In the last 2 years, I started struggling with some health issues, and I started piling on the weight FAST with no added changes to my diet. I have always been obsessed with healthy eating, and I virtually never drink alcohol or junk food. So here I am at almost 39 years old, 20lbs over my standard adult weight, and probably close to 30lbs over my desired weight. I started Reta 3 days ago on 0.5mg, and I am noticing that I have to force myself to eat and that I have no desire for things like bread or sweet things. So far so good, but my questions are:

1. Has anyone lost weight on 0.5 or is this simply the time when we give our bodies time to adjust?

2. Is it normal to feel heart pain while on Reta? I get this sort of stab in the heart throughout the day.

3. I welcome all tips to make this a healthy, sustainable, and effective journey.

Thank you!