Is my horse reacting to electric fence?

We recently installed a single line of electric wire between my 2 horse corrals. We have separation between the corrals but after awhile they build up enough dirt that they can stand on their dirt "mounds", reach over and bite at one anothers faces. They are playing. My young QH gelding is susceptible to sarcoids and the face bites can potentially turn into sarcoids so I have to be very careful about wounds on him. My older appy must have had his first experience with the "hot wire" because his behavior really changed. It just happened yesterday so last night when I went in to take his fly mask off he spooked several times and did not like me touching his face. I got my husband to approach him and my horse did the same thing. He acted like we were bogeyman and he was such a love bug!! He will lick you to death if you let him. He LOVES people and attention. He was lowering is head and acting strange. He was very agitated. He understandably stayed on the opposite side of the wire, as far away as possible. I was able to get a halter on him and I took him out. We have yard lights but when he approached a dark area he would stop and not move forward. He seemed frightened of the dark. He acted scared of almost everything. This is a horse that is VERY friendly, has good confidence and has no problems with night vision. I can understand that he's upset over the hot wire but will they get so upset that many things bother them until they settle down? He's eating, pooping, drinking and peeing normally so my guess is that this is a behavior problem. I'm worried this will change some things that he normally does without protest and that we'll have to start over??? My love bug is teating me like a stranger and it's really a bummer!