Sure sounds like Marek's.
What was going on with the birds the last couple of weeks? Were they being integrated into a flock? Often Marek's strikes juvenile birds that are under stress, though it can hit older birds too.
You may have had it in your flock for a while and it is just now surfacing in some individuals. And yes Marek's birds eat voraciously but lose weight, sometimes they have difficulty eating because their head starts to "twitch" and they can't manage to get the food in the mouth, usually if that is the case I wet their food down and gently guide/hold their head near the dish so they can feed themselves.
Some birds do fully recover but that seems to be rather rare. There are different forms of Mareks, some forms cause the bird to develop multiple tumors that can sometimes lead to a faster death, other forms don't cause tumors but damage the nerves and lead to long term (i.e. weeks or months) of paralysis.
Also if you want to have a bird tested do your own research regarding the type of test, I wasted $130 on testing when I lost the first Marek's bird, the test results came back negative and only later did I realize the necropsy only checked for visible lesions that often aren't present.
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