I have vestibular migraines as well. Lying still in the dark room seems the only resolution to these episodes - I sympathize with you as I know this struggle. But certain cravings do help ease these horrible symptoms you describe.
Yes, yes yes on cravings. I crave salt and ginger ale to ease nausea, but also chocolate. Chips or Saltines help nausea as well, something I learned from the great nurses in my spondyloarthritis infusion center as the body is searching for electrolyte homeostasis from sodium and at times potassium (coconut milk/water). The chocolate I could do without but I give in to the craving just to satisfy the desire. Usually, I try and keep it to a minimum, but I believe it's the caffeine my body is asking for.
Was reading up on why chocolate helps, and it seems that there is theobromine and caffeine in chocolate which both assist the nervous system - "Both theobromine and caffeine belong to the methylxanthine chemical family. The uptick in energy we feel from Chocolate and coffee results from theobromine and caffeine binding to the brain’s adenosine receptors. When adenosine binds to its receptor, this sends a signal to our body to calm down. "
As for the coconut milk you crave - I've heard of this craving. But from what I understand a coconut is considered a drupe or a stone fruit - a tree nut that people can have allergies to - so some can crave it while others stay away from it due to it possibly causing migraines as a result of the allergy.
Hoping you are managing well enough and that your cravings are helping. Warmly ~ Rebecca (comm advc)