mildred I'm sorry, its awful when you feel so bad isnt it? I was very sick with DS
Firstly as ironic as it sounds, being hungry might be making you feel more sick so if you can possibly bear it, try and eat something
Even if you're sick again, at least it wont be bile (which is awful to throw up) and your body will have kept even a little of it
Secondly, try and eliminate all other causes so tiredness, dehydration, smells etc
You could also try ginger, boiled sweets, mints, crackers or those travel sickness bands for your wrist, essential oils on a tissue (be careful which ones) etc
Lastly, if you cant cope, phone your midwife/GP and ask what drugs they can give you for it, prevention of sickness is better than needing to be in hospital on a drip so do ask
Bear it mind it usually goes away between 12-16 weeks (I know it seems ages off now but at least its a bit of an end point in mind)
I'm 4 weeks with DC2 now (and its thetiredness thats the killer this time round!) so proof you can get through it and at some point might be foolish to do it again!
Hope you feel better soon and have a healthy lovely little baby