[sciguy125]

The only stuff that I've found to work to my liking is Benadryl. Everything else seems to come in waves. It'll work really well for a few hours, then completely stop doing anything for about half an hour.

If you get the Benadryl pills rather than the gelcaps, you can break them in half. That seems to be the right balance between drowsiness and effectiveness. A whole pill stops any allergy symptoms completely, but puts you to sleep. Half a pill makes you a little tired but makes the symptoms managable.