I hope the A and D help, but I was on those even before I got Grover's.
Even if the cilantro doesn't help I hope to give you comfort in that for many of us the first outbreak is the most severe and longest lasting. Usually subsequent outbreaks are not as severe. I'm happy that you aren't dealing with the pain. Have you tried Flanax Linimento for itching? Amazon. Remove from bottle with Q-tip as it is a thick paste. The bottle is little but lasts for months. Nothing else I have tried helped. Many swear by Sarna, but it didn't help me. Flanax is capsacian (chili pepper) and free of my Allergic Contact Dermatitis in the inactive ingredients. Google how it works on itching. Since our histamines are elevated at night itching makes sleep difficult. I apply just before bed if in the itching stage, yes it will burn for a few minutes and this will go away, but in truth this sensation is a break from the itching. I use a long handled spoon for my middle back where I can't reach with hands as I prefer to be independent and not trouble my husband. Don't touch the Flanax, use vinyl or plastic glove because if you touch it and then rub your eyes or other sensitive areas it will burn fiercely. Once applied, a few minutes later I have about 30 minutes of itch lessening, enough to fall asleep. My first outbreak lasted 1 year yet now I have a pattern of about 6 months on and 6 months off. Also the itching and pain seems reduced with the subsequent outbreaks. Maybe this outbreak going on 1 1/2 months is much less because of cilantro stared 3 weeks ago. So far very mild itching and no pain yet. Can't figure it out all the triggers as my Feb 2018 outbreak started during winter and went away the beginning of Aug 2018 during hot temperatures causing sweat. Heat and sweat are known triggers. I now limit my sweat inducing activities to noon. The sweat really makes me sting even with this mild outbreak. If I start sweating I must shower as soon as I can.