The best advice I ever got was to spend a few days keeping a journal, and then isolating the number one or maybe two issues that bothered ME the most, and then look into them.
Sometimes, the folks who do the diagnosing are really good at helping parents figure these things out - so if you haven't asked for help - ask!
Jumping in and assuming that the homework tantrums are the worst, see if you can see a pattern to the types of work that cause the upsets:
Is it when there is a lot of work?
When the work is too difficult? too easy? to much pencil?
Is it when he is hungry? underexcersized? overexcited? exhausted?
Do rewards work with him? if so - what kinds?
To what extent has this 'crisis' interupted your ability to just spend fun time together, doing what he likes to do?
Each kid is individual, and while diagnosises are helpful, and sometimes nescessary, it's the sum of the individual challenges that really makes the difference, yes?
Love and More Love,
Grinity