Epilepsy and antihistamines

I have had this happen to me too. I noticed the last few years that using Benadryl made me feel "twitchy"  and then lead to seizures within hours and then mess me up for days (and that's just taking one pill!) but I didn't realize the connection until I did some looking into it. Now I know that antihistamines are a big mistake for me, which is hard because sometimes the Zyrtec just doesn't do the job. I need to look into some other options because I get really bad allergies in the spring and fall. 

pardon, Keppa is not for seasonal allergies, it is an anti-epileptic (sorry for any confusion)

Histamine is considered to be an anticonvulsive neurotransmitter as its low levels are associated with convulsions and seizures (Kiviranta et al., 1995; Chen et al., 2003; Hirai et al., 2004). Until now, research on the anticonvulsive role of histamine has largely focused on electrically- or PTZ-induced seizures (Vohora et al., 2000; 2001; Yawata et al., 2004). However, an understanding of the possible role of histamine in temporal lobe epilepsy and the brain regions affected has begun to evolve (Jin et al., 2007; Kukko-Lukjanov et al., 2012).https://www.ncbi.nlm.nih.gov/pubmed/26071045I pulled this off of a Pub Med research site.  There is a lot of research suggesting that lower levels of histamines can be seizure-inducing.