Nicotine Buzzzzzz

I have come to the discovery I am having a problem smoking most any cigar. The last few days I have smoked some "mild" cigars that in the past would never have given a thought about smoking; however, they are now knocking me off my rocker. The wife has finally started a massive diet and my caloric intake is about a quarter of what it used to be. I don't quite know how to go about combating the nausea/headache problem without upping the calories. Any ideas?