I can totally empathise; I spent the first 13 weeks of my pregnancy being sick/feeling sick/being totally exhausted. It was as though the life was being sucked out of me (sorry if that sounds too dramatic!). I also had chronic heartburn which was really unpleasant and put me off eating. Things I found helpful were:
Rennies orange- ok for pregnant women to take. These were/still are my lifesaver ( I'm 35+5)
Nibbling on almonds-either in their husk or removed. I found that if my tummy was remotely hungry that I was sick/would have terrible heartburn
Yoghurt- gave such a nice cooling sensation to my tummy. I used Yeo valley or Rachel's organic
Sipping on black currant squash
Spinach and red meats- think I may have been craving iron
Tomatoes and mozzarella cheese
Ice cold water
Eating what I fancied at the time (most of which was junk!) rather than what I felt I should be eating.
Out of interest, are you taking any pregnancy supplements? I found they (pregnacare) made me feel so much rougher so I just stuck with folic acid &vitamin D which calmed things down somewhat.
Good luck and I hope this challenging period passes really quickly for you.