I have a middle ear infection and have been on a zpack and sudafed 3 days. My ear is still congested and hard to hear from. Anything else I can do?

Be patient. The antibiotic will kill the germ in days, but it may take a few weeks for the mucus that decreases your hearing to leave that space & hearing improve.
Nasal spray. You could get an additional medicine, a steroid based nasal spray to help open up the congestion. Alternatively, for no more than one day, you could use a nasal decongestant spray, which can help open up the ears as well. It may take 7-10 days for the infection to fully clear.
Few ideas. The Azithromycin will likely help. For now try Ibuprofen 600-800mg every 6 hours, a humidifier in your bedroom and give it some time.