I think I've worked out what is going on. It's mostly emotional. I've had stress stomachaches most of my life, and this seems to be where the nausea stems from. In fact, the nausea itself was never especially a puzzle to me- I can get it sometimes when just eating normally- I suppose because emotions can be intensified on a fast it feels worse. 'A physical manifestation of emotional distress' might be a good way to describe it. The fact I seem to have a mild chest infection I think also adds to it.
I'm not sure why my appetite stopped. It never really got started yesterday. I think perhaps this is because I chose to break the fast, rather than waiting for hunger. However, sometimes hunger for me can be triggered by a simple cup of Rooibusch tea- and the hunger doesn't stop. I can only assume that the body is in the middle of important healing work, and does not want to resume food yet. We'll see tomorrow. I think it may be because I still have this chest infection that I thought had gone.
I'm quite happy breaking my fast with whole foods- it's never been an issue, and I don't consider it to be a causative issue on this occasion. However, I'll definitely be closely monitoring every thing I eat when I break my fast.
I've been doing too much, travelling on buses around town. I think this contributed to the nausea as well- partly just additional emotional stress. I should have taken it easy, and I was disregarding my own knowledge. I decided after a previous 26 day fast that I shouldn't go on buses for the first 3 or 4 days, after a fast of that length. I've ignored that, and it's tired me and sapped energy I need to recover.
I think if anything comes from this, it's that I must write down a timetable for refeeding, including activity allowed. And stick to it, whether I am bored or not.
Thanks again, replying has helped me clarify for myself the various things that are going on... and I know what I need to do now- above all else, rest :)