I have had several bouts of extreme sickness in this pregnancy, alongside normal morning sickness. It's never developed to a level to be HG but I went through a phase of being very, very sick for 6-12 hours every 3-4 weeks. Those episodes have got less and less as pregnancy has gone on. As people have said, anti-sickness medication is an option (though I have felt just about able to cope without this).
There is advice online from the NHS about when to see a doctor here: www.nhs.uk/conditions/pregnancy-and-baby/pages/morning-sickness-nausea.aspx
The key points on the website (pasted below) are, contact your doctor/midwife, right away if you:
- have very dark-coloured urine or do not pass urine for more than eight hours
- are unable to keep food or fluids down for 24 hours
- feel severely weak, dizzy or faint when standing up
- have abdominal (tummy) pain
- have a high temperature (fever) of 38C (100.4F) or above
- vomit blood
Also if you have symptoms of a UTI.
Are you able to keep fluids down at all? The best advice I had was to take very small sips. A sip of water. Then wait a few minutes and have a sip of squash. Then wait again and another sip of water. Don't try glugging down whole glasses of stuff at first. Or suck on an ice cube.
Then, if that stays down, try a couple of sips and build up slowly and steadily.
If you are not keeping fluids down at all, I would only give it a few more hours before giving your midwife/GP a call, as you don't want to wait to hit 24 hours at 9 o'clock this evening and still be in the same state (although you could ring 111/MAU at your local hospital that point). Obviously, I'm not a doctor, so this is just based on my experience. Do have a look at the rest of guidance above too and you can always ring your GP/midwife if you're not sure what to do - they won't mind. Though you might not have a number for the midwife yet at six weeks?
If you are keeping some fluids down, try to rest as much as possible as I think it has been shown that tiredness increases sickness.
Then, if you can build up fluids, try to build up some food as well. Dry crackers, dry toast, plain boiled rice, that sort of thing, worked for me.
Really hope you feel better soon. I know how miserable it can be. 