All I can suggest is try for a girl.
With both my girls I had HG & was allergic to Maxalon, so that didn't help at all. But when pregnant with DS I only had normal m/s. Maybe on the bad end of normal, but throwing up once or twice a day for about 8 weeks is so much better than 18 - 20 times a day for 25-ish weeks.
You can't guarantee the sex, I know, & it might not make a huge difference, but I feel so so lucky having a boy worked for me.

I've just found out I'm UTD again & don't want to find out what we are having, but I know m/s will tell me. Its ok so far... still very, very paranoid & scared it'll get worse. I think about everything I eat as if it were coming back up, coz some foods are just so much easier than others!

You could try Blackmores morning sickness formula. I started it this morning. I have no idea how good it is. Probably won't help with HG.
I guess just getting your DP to do anything that provokes it. Keep the house clean with a scent you can tolerate, cook the foods you can't stand the smell of. Not a magic cure, but a start

It is hard, very very hard. I don't know if its the same for every one else, but I was so tired too. A trip to the loo would put me to sleep for 2 hours!

FWIW - I opened my windows this morning coz my clean house stunk & was hoping for the smell of fresh air...I copped wet dirt instead!!!