Mono can be transmitted just through sharing a drink . Z-pack is not obsolete and I'm 99.9 % sure what ever you have is not immune to azithromycin , though it is a possibility you have contracted a anti-body resistant pathogen .. Doubt it though Stay positive . Maybe u do just need to stop the cycle man . Steroids suppress your immune system . Not saying that stopping the cycle is going to cure you but it might be a step in the right direction