Whoa nice work there kamikazer. I've been interested in this matter-antimatter for years. Lemme share what I've learnt.
There is an antimatter for each type of charged matter in the universe. For an electron, the positron was found. For the proton, there is the anti-proton. I think you get the idea. This anti-thingy extends all the way down to the quantum level, that means for each quark, there is a similar anti-quark, too. (if i'm not wrong there are 6 types of quarks. So there are also 6 types of anti-quarks).
Scientists have actually proven that these anti-matter exists, at least for most of these particles.
How do these things work? Actually, it's the same old einstein again! Remember his famous equation here. E = mc2 so this can calculate how much energy can be released if a matter-antimatter collide. Whatever the mass of the particle you calculate, just substitute it into 'm' and given c=speed of light=3E8 m/s. thus 1g of matter gives you 9E13 Joules of energy! That's 90,000,000,000,000 in numbers. For comparison, P = IV = E/t, so for a 100Watt lamp this energy can light the lamp for 9E11 seconds = 1.5E10 minutes = 250,000,000 hours = 28519 years, rounded off!
Ok take the other way round. For 1g of matter to be created, m = E/c2 so i'll rather not do the maths, you try it out.
The history of antimatter is just as fun. I think it is not correct to say for every million anti-matter there's a million and one matter. Just, for the sake of simplicity, that there is more matter than antimatter. Thus, all antimatter is gone, at least in this universe. For parallel universes I'm not sure though (yah... who can?
). And to my knowledge, matter-antimatter twins is created every second, every time, it might even be around you. As to how, they are said to be "random occurances". From nowhere energy will form matter-antimatter twins. Then the anti one will disappear again, colliding either with that matter or other matter. Why we don't see them, firstly, they are so small in size. How do you see the formation of an anti-quark?! Secondly, they are very easily destroyed, since there's so much matter here they will meet one in no time and gena become energy again... All this happens in a time measured in 1E-(20++) seconds.
I do hope they can manufacture and store antimatter soon and cheaply, so we can finally be truely the space-faring species. But before that, I wish for world peace, or else we would never live to see us out of the solar system!!!!
"The universe is composed mainly of hydrogen and ignorance." 
