Can I give him Benadryl?

I’m a new mom.. and my 8 month old has HFMD..

I know there’s no treatment. He’s extremely fussy.

I’ve read not to give under 2 years old.

But im just curious if anyone else has gave their baby any?

A small dose to help them relax.

He doesnt sleep well. He stays up screaming and I try so hard to soothe him.

Or if you have any other tips for HFMD ! It would greatly be appreciated.

I feel terrible for him and I feel like I’m going crazy. I don’t know how to help him