Soda has got to be one of the biggest waste of calories on this planet. ZERO nutrition, ZERO filling power - LOADED with sugar. No redeeming qualities whatsoever.
Ginger ale is about 85 calories for 8 oz. No great shakes there either.
How about seltzer? They've got plain and flavored.
How about a nice cup of hot tea? Or chicken soup? or chicken broth or any other soup?
Get past this. I know you're used to doing things one way, but you've got to get past this and master a new skill - wanting something and not having it - especially given that you're "sick-ish" and this is a prime example of when you would have that soda. You don't want to start that downward spiral. DON'T TAKE THE CHANCE. You don't need it. It won't/can't cure anything. You're a mature, rational adult - you must make mature rational decisions.
Hang tough. You will be thrilled with yourself for not giving in.
Feel better.