Some possibilities:
No culture taken, perhaps the antibiotic being given is not effective against what ever sickness the snake has.
Too short of an antibiotic regimen, should be a minimum of 30 days, but you should see some improvement after the first few injections.
It could be something other than a bacterial infection.
Don't listen to any one person regarding changing the way you keep the snake. Some people see improvement when they increase / decrease humidity in the case of an RI, but either of these could also make things worse.
Be weary of "home remedies". You'll see quite a bit of controversy regarding vapo rub type treatments as the ingredients can be respiratory irritants which may stimulate mucous production and inflame the airways.
One treatment that is widely accepted as safe is Nebulization of F10 SC veterinary disinfectant.
If it ends up that you just have the wrong medicine, I would have the vet show you how to give the injections at home so that you aren't stressing the snake more than necessary taking it to the vet every few days. It's very easy to do.
You must also make sure to correct any potential husbandry mistakes that may have caused the problem you are facing. If you don't do this, treatment will be ineffective.
I have seen the "sneezes" you describe and they are terrifying.
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