OK, back to post my story.
Reading this I can see I didn't have it as bad as many of you, I suspect that may be because I don't have a very good sense of smell, and I've read things that say smell plays a very big part in HG.
Anyway I've only been pregnant once so I don't have different experiences to compare.

I started feeling really obvious MS at about 7DPO and then started throwing up constantly at about 6.5 weeks I think. At first I thought I had gastro because I just thew up solidly for 3 days and couldn't keep anything, even water, down, and then on the 4th day I felt better. But this pattern just repeated itself over and over again so I realised it was MS.
I thought the vomiting was par for the course so I didn't see a doctor or anyone until I had my first ob appointment when I was 8 weeks, she weighted me and I realised I had lost 5 kgs in 1 week. She gave me maxalon which actually did help me to a degree. On the days it worked it made me throw up less (perhaps only 4 or 5 times a day) and made me sleep most of the day, but more often than not I would throw up the water I had with the tablet and it wouldn't do anything.
I remember my DHs 30th birthday when I was about 14 weeks. I wanted to make it a bit of a big deal so I decided to make this special chocolate mud cake recipe. I didn't have the ingredients for it. Mum was staying at my place but doesn't drive so I drove us to the supermarket, sat in the car with a bucket and chucked my guts up while she went and got the ingredients, then we went home and cooked that damn cake, doing one or two steps, throwing up, doing another couple steps, throwing up again etc etc. Hope he appreciated it!
I don't really remember the exact times but I think it eased to about 3 spews a day on the sick days (which were probably 3 out of every 5 days) around 25ish weeks, then later it twindled out to perhaps only being sick once a week or once a fortnight, but the nausea remained the whole time and I felt only a few minutes away from being sick all the time up until delivery day. Actually funny story, I had an epidural towards the end of my labour and THAT killed the nausea. Who would have known? I was actually 10cm dilated but because I didn't feel sick I suddenly felt ravenous and was begging the midwife to feed me! Don't think they would consider that option for treatment in the first trimester though!

So, to respond to some of your posts.....

clover - the impact getting pregnant again will have on my DD is something that weighs on my mind soooo much. I just don't want her to go for weeks with me just laying on the lounge doing nothing. My mum lives 6 hours drive from me and I don't have any immediate family any closer than 4 hours away. But I am trying to come up with a plan.

AAS - the hospital bags sound good, I mostly used freezer bags which were good cause I could always have them in my hand bag and after use I could tie the top and throw it away. They also passed the 'simultaneous throwing up and driving' test a few times!

fionaw - sorry you are living through this now. I remember occasionally having some bladder issues when throwing up. I was wearing liners most of the time because I had major fluid leakage from every possible orifice the whole time so I just wore that and pretended I didn't know what was really happening.

Diamond Girl - I have absolutely everything crossed for your scan on Tuesday, I am sure everything is going well in there. I guess that is one thing about HG, you never really go through that doubt about if things are still happening down there.

Lily Dust - I thing you are right, I think you do forget to get over the trauma. I had totally forgotten about the shakes, headspins and heart palpitations after every vomit until I read it here.