YOU SAID:
My eyes are so itchy due to my allergies.
INTO JAPANESE
アレルギーのせいで目がとてもかゆいです。
BACK INTO ENGLISH
My eyes are very itchy due to allergies.
INTO JAPANESE
アレルギーのため目がとてもかゆいです。
BACK INTO ENGLISH
My eyes are very itchy due to allergies.
That didn't even make that much sense in English.