Hi Fern and welcome. Glad that you found us! You will find a lot of info in the blue banner above that says New Members....
Avoid MSG, alcohol, fermented foods etc. Eat clean. Msg can bring on one right quick for some.
Caffeine: In an Energy drink or shot, V Energy, or coffee. If you can hack the Energy shots, some say the taurine in them is helpful. Otherwise, any strong caffeine. Most want them ice cold. Slam it down - drink quickly, at the very start of a hit.
You can hyperventilate too and exhale with a crunch to get rid of the CO2 in your lungs. Many will suck in the cold air from an AC vent in the car. There are proponents of ice packs too.
A really hot bath - shallow - helps some by opening the blood vessels in the legs. I have sat in many a screaming hot bath. I just kept adding more and put a cold cloth on my head. Well, cold water type cold. Not ice!
Benadryl can help a lot too. Take only at night if it makes you too sleepy. Also, there is Melatonin in the 20-25mg amount. Do not take both at once! Try one, then when you know how it affects your balance, etc. Then you can add the other. Add the Melatonin 10mg to start. Or less.
If you get hit at night, then sleep in a recliner with your head above your heart. It will enable you to get up and hitting the caffeine, cold air, hot bath, whatever works for you. We are all different. Some get great relief from an ice cube held against the roof of the mouth on the CH side.
How about your experience so far? Share a bit so we can help you better.