It might be a long shot but I've been vomiting 4-5 times a day and tried maxalon which did nothing. I tried Zofran and it helped with the vomiting but not the nausea. I ran out of zofran and in the meantime I got some Herbs of Gold Morning Sickness relief from the health food shop. It has a high dose of b6 which apparently sorts out blood sugars, chromium and ginger. It has worked wonders. I'm still vomiting in the mornings but not during the day and it eases the nausea during the day so that I can function. It's worth giving it a shot. I tried other herbal treatments with my DD and they did nothing but this is amazing stuff.
Good luck hun, the all day sickness is so horrendous!