Any tips for an unknown allergy?

hi so i have a horrible allergy but tests and such can't find it out im almost always sneezing or i have a runny or stuffy nose and other times my throat or stomach get bad. right at this moment im having all that going on and i need to sleep. any tips or ideas on how to sleep when you feel like sh! t and there's nothing you can do about it?
Any tips for an unknown allergy?
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