I have come across it a couple of times in my work over the last 12 months. Both patients report the only ease of symptoms is showering and one patient in particular masturbated to rid himself of the symptoms also. I have heard of some patients showering so long they used the hospital's hot water supply. It is a real condition, which thankfully does not affect everyone. Unfortunately not a great deal is known. I have attached two articles a colleague send me a while back for those interested. It is an interesting little symptom.
cannabinoid-hyperemesis-syndrome.pdf
cannabis hyperemesis.pdf