Just tieing some of these things together, and drawing in personal experience of others on here...
If a child has
A)learning difficulties,
B) food intolerances
C)sensory issues,
its not surprising i suppose that these children; learn at a slower rate still when food eaten causes tummy upsets, headaches and generally feeling unwell. This taking all resources just to grow (if only very slowly as does DS5) and survive each day. Having to cope with an overload of sensory input, exacerbated no doubt by the food intolerances again. Is there any wonder at this point that the child regresses and resorts to the calming themselves by stimming? No wonder the action of learning simply doesnt get a look-in!
so at this point speech looks impossble task, given that the child has to be able to concentrate firstly, then understand, THEN form the words... something an NT child would take a year or more to learn. Faced with these problems, its amazing that these children manage any communication at all, and no-one would blame them if they didnt!
I feel that after this lightbulb moment, i hope to find just one more ounce of patience half way thru another 2 hour meltdown! tho i say that in the calmness of the morning, when the day is just starting...