Reta chest pain(ish) & Oura

Anyone felt a weird chest feeling? Not pain, but a kind of pinch? I went to the doctors and got a full blood panel, blood pressure all that. Oura ring telling me for the last four weeks (my fifth week on reta) that my HRV is low and my resting heart rate fair and sleep is fair.

Has anyone's resting heart rate stabilised or gone back to normal? It's been over a month and I've lost ten lbs and I feel great otherwise, just tired and out of breath at times - wondering if that's the rapid weight loss or the heatwave I'm experiencing in London atm (no AC here). Would love to hear experiences around this space/area?