I'm not an expert, but I am not sure that you have a case of rage there at all. But it would be good to get in touch with Linda, as Colin suggests. She really is an expert.
Rage, as far as I know, is significant in that it comes on without any kind of trigger. What you are describing sounds more like behavioural problems to me.
I do think it is something you should try to deal with as soon as possible, and I would suggest getting in touch with a GOOD behaviourist who will come to you at home and assess the situation, then work through each issue with you.
Diet may be a factor, and certainly one that is easily fixed, but my guess is that this is more than this.
If you could let us know where you live, you might find some recommendations for a behaviourist. Also we have some forum members who are very able to help and advise from a distance, but that won't be enough.