Try Loratadine (Clarityn). It works well for me and doesn’t make me drowsy. One of my clients who is an airline captain  told me that Clarityn is approved to use while flying, which is rare for any medicine, and has been well tested to ensure no drowsiness.

  Just take one tab every 24 hours, but only when you need it. All of the hay fever medications will lose effectiveness over time with continuous use, so you can switch to Allevia after a few months, then back.