Two days ago a drank a cup of regular coffee, went to work and if felt like I was gonna just lose my mind. I felt lightheaded, shaky, nervous and really couldn t focuses on anything. I finally had to leave work. I went home around 7:30pm, went to bed at 8:30 but didn t really sleep that good all night. The next day I has no caffeine al all and had a great day. Today I drank one cup of coffee and I had to leave a family lunch because all those symptoms came back.. This happened around 1:30 this afternoon. I went o bed for a couple of hours and sleep pretty good. It is now 6:30pm, my head isn t 100% clear but I m feeling a little better. Am I having some kind of reaction to the caffeine?