You really need to talk with your veterinarian and your groomer about this. In some dogs, Benadryl can have the side effect of causing drowsiness or sleepiness, but it isn't a true sedation; Benadryl is actually an anti-histamine that dampens down allergic reactions.
Your veterinarian can talk with you about the different true sedations available (all of which require a veterinarian prescription, incidentally) as well as the potential problems with administering it to your dog. Your groomer needs to be in the conversation as well, particularly if the grooming site does not have a veterinary clinic on site or at hand to deal with any potential side effects (such as a bad slide from sedated to aware).
A better long-term option is to work with your dog and a professional trainer who has experience desensitizing dogs to acclimate your dog to the grooming location and process. You may also want to check out a different groomer and see if your dog has as bad a time there as he did at the last place.
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