I am going to offer an opinion here, based on math. Bear with me for a minute.
Using a conversion between mililiters and grams, and a comparison between inhaled sodium and the sodium in the following foods, here is what I computed:
1 medium egg (50g) -no salt added in cooking) 70 mg sodium
1 oz potato chips (about 12 lightly slated) 100 mg
1 -4 ml (4g) vial 3% sodium (if none escapes as vapor) 120 mg
1 oz cheddar cheese 180 mg
1 g ( about 1/4 tsp) salt 400 mg
Average sodium in a "healthy" frozen meal 500 mg
Recommended Daily Allowance of Sodium <2300 mg
As you can see, the use of sodium nebs does count - but it can easily be offset by adjusting your diet only slightly. So I agree with your doc that the swelling is probably not from the salone.
Sue