Update:
Just got back from Frite Aid, where the pharmacist said that calamine lotion wouldn't do squat, but that Benadryl cream would help. I told her I was already taking Benadryl, and she said it was ok to do the cream also. So I did, and THEN I read the box... and it says NOT to double up. So I assume that in another half hour I'll be very much a zombie. Oh, and she said I could take more Benadryl tablets at bedtime. Perhaps i should combine this with alcohol.
Thanks for all the replies.