Can you try to print out the Meds pages NICE meds here? Also, go back to the doctors with your husband to act as an advocate. Say that it's essential that you can work, or you can't repay the mortgage and that obviously puts your home at risk. Which is not good, when you have a baby on the way.
Lay it on thick. HG often lasts until week 22 (though some people improve earlier!!) and if you're unlucky, even longer.
promethazine is fairly good, but different people respond to different meds. At -this- point, suggest you ask for prochlorperazine as well. You can take both. The best is ondansetron, but it's very expensive and also causes constipation sometimes. Prochlorperazine is a travel sickness remedy and also (at high doses) a good anti-psychotic, but it's a flexible med weith several uses, so don't be alarmed by the scary sound. Many, many, many preg women have taken it.
If this doctor won't help, then perhaps try another... there is another option if that doesn't work, ringing the Preg Sickness Support helpline, but it's better to get the meds through your own surgery if you can.
About the drooling, its a typical sign of HG. When you go to the doc, take a bowl and spit into it. The rest of the time, you can spit down the straw into an empty drinks packet, and put a towel on the bed at night.
When you go, emphasise how bad you are. Don't try to put a good face on it.
Good luck, and post here anytime. Bad preg sickness is absolutely awful, most people don't have any idea how bad it is :(