I've been feeling blah for a few months now, but the past couple of weekends have been exceptionally unpleasant. It's either been the relatively large amounts of dairy (conventional butter and some cheese; I normally avoid dairy other than clarified butter, but when I'm not at home for long stretches of time, I don't have much of a choice. Conventional butter is better than canola oil, I'm sure), or my allergies have been kicking my ass. I want to start taking an allergy medicine just in case, but seeing as I don't like to take medicines unless I need to, I'd like to find one with the least side effects. Are there any allergy medicines that you can recommend to me?
EDIT: Maybe I should clarify how I feel. I'm not necessarily talking about stuffy runny noses and itchy throats (though I have had some of that recently), but more like lightheadedness, trouble concentrating, low energy, and general "feeling off" for several months. I've eaten paleo for over a year (about 60:25:15, generally low fructose, active avoidance of wheat, n-6, and most dairy besides clarified butter), while being pretty strict for the last three months or so, and I'm fairly physically active at work. I can't see any nutritional deficiencies or foods I should avoid in my diet, so I'm just assuming it's the most probable cause. If I try Claritin for a month and it doesn't work, then at least I'll know one more thing that isn't the problem.