Have any other singers ever lost their voices due to allergies? :(?

Absolutely. As far as meds, talk to your doctor before you take anything over the counter. They can help your symptoms, but end up drying out your throat and sinuses which also messes up your voice. You can avoid allegens whenever possible--stay indoors when the pollen count is high and run an air filter. If you have a serious problem, you might just have to see an ENT (ear, nose, throat specialist) or an allergy specialist. Or just wait it out. If you take voice lessons, you can discuss with your teacher ways to "sing around" your problems until your voice clears up again. You may have to pick and choose songs carefully, but you might be able to bluff your way through--pick songs where a "rocky" voice might actually work for you. Look at Joe Cocker. He sounds like he's having a terrible allergy or cold going all the time! LOL

First at all, you need to speak to a doctor about your allergy. We can cure allergies quite well these days.

Until your allergy is gone totally, you really should not sing at all as you risk a serious vocal problems.

Once your allergy is gone for good, you should have back all your voices :O)

Actually, there is only one voice, and those head voices and registers named everywhere are just bullshits developed by people as their excuse for their unabilty to sing correctly. Try use your 'chest voice' for whole your range - it really works. Once you reach the point you better swap you better to learn how to continue in the so called 'chest voice'.

Good luck

Of course. Professional singers are human, its not like they are from a different planet. They are just like everyone else. Any type of strain on the voice can damage the vocal chords and make you lose your voice, sometimes permanently.