Sounds like the reaction that I get when I take to much, at higher doses the side effects outweigh any euphoria that I wanted to experience. A huge histamine reaction seems to take over and detract from the high that I intended to experience. I always get a red face and massively uncomfortable amount of itching, I read somewhere that if you take more than your liver can process at one time the histamine reaction seems to intensify by a great magnitude which I would agree with...could be bullshit though as there were no sources provided, the dose that is described as the ceiling dose for the effects of codeine is 400mgs but I believe this can differ greatly between individuals seeing as how we all have a variable amount of the liver enzymes needed for processing codeine into morphine which would change the amount of codeine needed between individuals needed to have the same effect even without any tolerance.
Anyways, I wouldn't worry as Sekio said because it appears to be pretty standard with Codeine. This reaction seems pretty intense and I can see why you are worried, but histamine release is just an effect of Opiates/Opoids in general which is also responsible for allergic reactions. If you are actually allergic to codeine you would have had much more severe and possibly life threatening symptoms such as your throat swelling up, you said you have abused codeine before and that has never happened so I wouldn't worry about it.
I just saw your last post, something you ingested could have effected the enzymes in your liver allowing the codeine to be more efficiently processed equaling a much more intense effect from the same dose; alternatively it could have been something like an empty stomach or maybe alcohol in your system at the time. (alcohol allows for a much faster onset of the codeine causing the codeine to take effect much more rapidly intensifying the histamine reaction)
