I am sorry that you are ill.
I wouldn't blame you for going to the doc and getting an antibiotic, but even if you went to the doctor, you might just get a lecture about how he doesn't want to overprescribe antibiotics.
A couple of suggestions: Make sure the Robitussin or other OTC medication you are taking has an expectorant in it. You want to make your coughs productive and keep the phlegm off/out of your lungs as much as possible.
Get some echanacea angustifolia drops and use them for a week or two. You can add them to your tea or any warm drink. This is an old Native American remedy that actually has some scientific studies that back up its efficacy. Here, Wild Oats Grocery sells it in a one ounce bottle, with medicine dropper, for about $9 per bottle.
A vaporizer, even a cool mist vaporizer, would be worth having, especially for use while you sleep.
Gargle periodically with warm salt water. Not only will this ease your throat, but it will help equalize the pressure in your ear canals. You don't want the infection getting into your ears.
Some good vegetable soups would help, especially if they include onions and green vegetables, with plenty of vitamins. Vitamin supplements with C and Zinc might also be helpful.