Cough and Colds Medication for Diabetic

I have been coughing every night now for a week; I thought it was just an allergy, but I was wrong! This morning, it was bad because it was couple with a sore throat and runny nose. Thanks to my son who is kind enough to share with me his cough and colds. We are now coughing, but it doesn't seems to bother him at all; but it bothers me. Anyway, I haven't given him any medication yet...and I have not taken any myself. I know as a diabetic person, I should be careful for what medications I put in my mouth. Sandy told me that I can take OTC medicaion like Robitussin CF which it is also good because is sugar and PPA free. It has been re-formulated to be PPA free, and now contains pseudoephedrine instead. The other active ingredient is dextromethorphan, and together, this preparation helps to suppress cough and also helps to expectorate (which means it makes the bringing up of phlegm easier). Robitussin CF is sugar free and alcohol free. It should be used with caution in patients with high blood pressure or heart disease, and should be avoided in patients on MAOIs. This medication is not recommended for pregnant or nursing mothers. Same thing with Benylin Adult which is sugar and alcohol free, and provides some relief from a non-productive (dry) cough. The active ingredient in this formula is Dextromethorphan. Though hubby told me it doesn't really going to help suppress my coughing...he thinks...I still plan of going to the pharmacy and bought one for myself. Sometimes, I call my husband a doctor because he has his own opinions with medicines which I don't usually listen and follow.