High heartbeat after walking and waking.

Hello sir i am suffering from high heart rate problem since 23 dec 2023 I just done all test ecg 2d echo all are normal but after waking my heart rate is 170 after half an hour it come to normal without taking medicine also but after walking again it starts high  and Dr prescribe me 2.5 ivabradline after taking it heart beat is normal but I don't want to relay on medicines in this age i done ecg when I was suffering from hight heart beat at that time ecg tell sinus tychardia and in echo sinus tychardia were not there am very health conscious my cholesterol was 174 LDL and HDL is normal but at past it was quite high total cholesterol 200 trycediles cholesterol was normal thyroid was normal acid reflux problem is also there after excercise pain in chest but after getting relaxed also moderate chest pain is there for sometime and just bcz of all this anxiety also there overthinking ? Is I am suffering from heart problem? during ecg and echo I was having anxiety that's why heligh heart rat