Hunger - Extreme Concentration , Anger And Emotion Problems

I've been trawling the web for some kind of forum that relates to something that i have experienced (& been troubled by) my whole life with no luck! So i thought i'd try this and see if anyone can help...

I'm (and have always been) a healthy eater, an active and a fairly balanced 'normal' person, i eat pretty routinely at regular points in the day and would say that i have a very round diet.

If i don't eat as soon as i'm hungry I start to loose control; I have no attention span or concentration, i get irritable and angry, i loose all sense of reason or rationality & have been known to cry/rage in restaurants whilst waiting for people to order. This is very unlike me; i'm normally very bubbly, easy going, sociable and not a particularly emotional person. Once it starts it just gets worse and worse until I eat (sometimes i can stop it with a high calorie drink like a beer!) and is not only uncomfortable for me but any people around me.

My Dad's side family are all the same (if dinner's late in my family's house, all hell breaks loose!) with some of us more able to control it than others. I am the worst and cannot control it even though i can see at the time that my behaviour is bizarre and unreasonable. The point is that it looks like it's hereditory in some way.

My boyfriend is at his wits end with me and has persuaded me to try to find out the cause of the problem. At first he thought that it was psychological, in that i've always eaten at routine times so can't handle changes in my digestive routine or that i've learnt the behaviour fom my Dad. Many people have suggested diabetes to me but i haven't as of yet had any testing done on my blood sugar levels.

I want to know if there is a possibility that this could be diabetes?
Whether i should get checked out?
Whether there are any other physiological conditions that could be causing this?
Whether it is possible that it is a psychological condition?
If there are other people who feel like this?
Any things I can do (apart from always having food on me, my boyfriend also does this) that might help to overcome this problem?

I would be so grateful if anyone can answer any of my questions.

Many thanks,
xxxx