Combinations - Venlafaxine with antihistamines

[tripfromthetropics]

My feline friend has been taking venlafaxine for about 3 years for anxiety. She's always had problems to sleep, someday when she was sick sh discovered dimehydrinate (dramamine) and other antihistamines can put her to sleep and can give a nice feeling, something like euphoria, She has xp with opiates, barbiturates and benzos and prefer antihistamines than the 2 last ones when talking about "nice feelings". Some days ago when she forgot to take venlafaxine and took dramamine she felt sleepy but without the nice feeling and instead of it felt a little anxiety that is what lot of people say it gives you.
My point is, do someone ever made this combination? Can venlafaxine block the bad symptons of the antihistamines?

Thanks