You have a problem with beer and think it has nothing to do with
weight loss?
16 oz of beer have roughly 200
calories. So if you went out, had 4 or 5 beers, you'd easily consume a 1000+
calories just in beer. Do you include that in your 1800
calories per day?
And alcohol has more side effects - makes you hungry, makes you retain water (supposedly) and some other things that I can't remember right now. But it's not good. So the first thing I would do if I were you - ditch the beer. And ditch the
diet while you are at it. Any of those fad diets have the tendency either not to work at all, or to backfire big time once you come off them.
Try changing what you eat, eat healthy, exercise (which I assume you are already doing given the fact that you're kickboxing), and you should be fine.