What Do Pulsations Below The Rib Cage On The Left Side Indicate?

Hello I am a 23 year old male, 6”4’ and 185 pounds. I have been feeling a pulsing sensation right below and to the left of my rib cage on my abdomen. I did go to the doctor for it and they did a chest X Ray and an ultrasound, even did a heart catheter and everything came back negative/healthy. I did have some PVCs but they said it was harmless. This has been ongoing for a year and it’s a daily sensation. I don’t feel it all the time, but it does seem to happen when I have a PVC. So far I haven’t pursued it further but I’m wondering if it might be gastrointestinal. I also feel like it happens more often when I eat a lot. I do have a lot of anxiety, but it seems a far fetched to have it happen for over a year just from anxiety alone. My eating habits aren’t the best and I am not very active either. My blood tests so far have come back normal with the exception of slightly low potassium and slightly high bad cholesterol, but nothing too bad. Though those are old tests. Thank you for your time