Nose Swelling Due to Salt and Exercise After Rhinoplasty

It's important to avoid salty and spicy food after your rhinoplasty surgery. Consuming too much salt can raise blood pressure and cause water retention. Moderate to intense exercise increases your heart rate and blood pressure as well. Therefore, you might have increased swelling which can prolong the healing process and negatively impact your results.
However, in your case, 3 years is a very long time for your nose to still be affected by these. I suggest you contact your surgeon and get examined again by him. Best of luck to you.

It is unusual for the nose to swell 3 years after a rhinoplasty after a low sodium diet and exercise.  Seek feedback from your rhinoplasty surgeon.

Salt and exercise can cause the nose to swell due to increased blood flow with exercise and edema from salt.
After 3 years this is unusual, so I suggest you see the surgeon who did the surgery just to make sure nothing else is going on.

Even though it has been three years since an open rhinoplasty, you are experiencing a fluid shift in your nose all due to lymphatic drainage. Fluid tends to follow the salt, and if you have had a salty meal, the nose will stay more swollen for a period of time. Exercise can also exacerbate this problem.

While it is commone during the first year to get swelling from high salt diets and exercise, it is uncommon at 3 years.  Perhaps go see your doctor for follow-up.