Hang in there.
I got sick several times (twice in a month) when I first started this. I had known before that I had gastroparesis. I would get sick maybe once or twice a year, but the thought of it coming back so often was almost enough to make me give up. At any rate, I began supplementing with magnesium citrate (and D at the same time) and it went away after about a month. That was three months into Primal I think and now I'm working on at least 4-6 months without any problems.
Cravings were pretty intense for me too, but they go away if you stick with it. It's worth it believe me.
I'd second what theholla said about the fruit juices too. If you are looking to get ketoadapted, sometimes it could be best to just drop fruit out of the equation for a little while.
"So often times it happens that we live our lives in chains
And we never even know we have the key."
~The Eagles, "Already Gone"