Hi Delia,
I just wanted to write and say you're not alone.
My 12MO is doing EXACTLY the same! (for about 3 weeks now)
If it's sweets he will eat it but come to something with nutritional value and he just has a tantrum.
I have made sure I am not giving more milk because I have noticed that if I do there is even less chance of getting the food down.
The other day I was so frustrated that I just gave him the spoon, and although VERY messy to my surprise he actually got some of his dinner down through experimenting / playing with the food.
My take has so far has been to keep my fingers crossed that it is just a phase and hope for the best each meal, and not exhaust myself with cooking elaborate meals that may not get eaten... back to basics!
I hope this helps, and I am also interested if there are any other suggestions out there???