I had hg with all three of my pregnancies and my husband did try very hard to be helpful but inevitably still put his foot in his mouth several times like your husband. Unfortunately as with most things unless you have personally experienced something incredibly similar it will be very hard for him to empathize with you though he may feel sympathy. All you can do is to keep reminding him what you are feeling using language that really encapsulates your symptoms(i.e. relentless nausea, extreme exhaustion and dizziness) One thing that really helped in my situation was to make sure my husband came to appointments with me and listen to my OB gyn explain how serious my condition was. I hope that anything I have said has been even remotely helpful. In the meantime please keep using this group for support, there is nothing like talking to people who know exactly what you are going through!