I'm sorry you're feeling so rotten. Are you taking a decongestant? This will help get the fluid out of your ears while the antibiotic is working. Also, if the coughing is keeping you awake the best over the counter med is something with an anti-tussive (dextromethorphan) along with an expectorant (guifenisen). You will have equal success with store brands or name brands so I buy the one that is the least expensive. Guifenisen loosens up the secretions in your lungs so your cilia can move them along your bronchial tubes, causing irritation and giving you a productive cough (the good kind of cough) BUT
this med won't do its job if you don't drink enough fluids.
I make it a rule to carry a water bottle and drink two swallows with each cough. Now, this sends you to the potty all day long but it really breaks up the crud in the lungs! The sooner you get that stuff out of your lungs the less likely you will be to have bacteria take up residence and give you pneumonia. Keep on resting and taking care of you, because if you don't, who will?