Hello, this is Dr. Bruce and I would like to help you with Nino.
I'm sorry to hear that he is acting so uncomfortable.
It sounds like he may be experiencing some sort of allergic reaction. You were correct to give an antianxiety medication and an antihistamine. I would go one step further if he is still acting this way. I would give another 25 mg of antihistamine.
Also, give him a bath in case whatever he is reacting to is still on his skin.
If this does not seem to help him, and the problem is continuing, then you will need to take him to the vet for evaluation.
I hope this helps and that Nino is feeling better very soon. If you have any follow up questions, please reply to this post and I will get back to you as soon as possible.