I'm taking AZITHROMYCIN and my tongue has swelled up I was wondering if that was normal and if not what should I do?

No it is not normal. It is a serious side effect, probably allergic reaction, that requires immediate medical attention. Per FDA:

"Stop using azithromycin and call your doctor at once"

See Azithromycin side effects (http://www.drugs.com/azithromycin.html)

"Get emergency medical help if you have any of these signs of an allergic reaction to azithromycin: hives; difficulty breathing; swelling of your face, lips, tongue, or throat*."

Please act accordingly.

*underlining added for emphasis