I have something similar that pops up when I get really stressed and I found that L-Lysine helps keep it to a minimum or prolongs how long I can go without any symptoms; like over a year sometimes!
You can get L-Lysine 500mg at any vitamin store and it's not expensive. (I get mine at WalMart)
I take one before I go to bed with a glass of water- and if I "feel" the symptoms coming on I double up on the dosage.
You may give it a try to see if it works for you.
Bob