Older dog with night time anxiety?

We have a 9 yr old husky greyhound mix. We have had him for about 9 months, and he was a rescue. He has thunderstorm phobia, which we are trying to treat with noise therapy and Benadryl. This last week or so, he has been showing the same signs of anxiety when there is no thunderstorm, and we are at a loss. I don't know if he is truly having a anxiety issue or realizes he gets more attention when he acts like that. Has anyone had this issue? We've heard about Valium, but feel like we can fix this without it. Thank you in advance for any tips :)