Then it was migraines.
Then it was migraines also with hard cheeses, but only if I ate too much.
On Saturday I got a migraine after eating a can of spaghettios, which apparently contains milk. Then I ate a granola bar with a milk-containing frosting drizzle (which was the only snack I had packed) and my face was flushed.
Looks like the shopping list just got more complicated.