I had wretched m/s from about 5.5 weeks until a couple of days ago. Now I can pretty much tolerate most foods and meals. WTF? Why is it gone? 
I don't have another scan for 4 weeks and this is freaking me out.
dx'd with severe endo and poor egg quality
3 IUIs were all BFN
IVF #1 = c/p
IVF #2 = BFN
IVF #3 = beautiful baby girl born 2/2011;
8/2011 Surprise BFP - natural m/c at 8w;
TTC #2 2011-2012; 2 IUIs = BFN; IVF #1 = BFP 9dp5dt beta = 328; 11dp5dt = 650; 13dp5dt = 1114; 18dp5dt = 4747

Re: My m/s is MIA??? Worried :(
I just posted about my disappearing pregnancy symptoms (particularly m/s) as well and so I'm in the same boat! I feel much better reading the helpful responses from the women of my post and this post and now, I'm not worried!
I'm 9 weeks 2 days I think and my m/s is almost completely gone! Perhaps our m/s is taking a break? Though, I wouldn't mind if it never returned! Try not to worry too much. That's my newest mantra