I didn't quit caffeine. I still drink tea. But I mostly stopped drinking coffee a while back. A few weeks ago, I tried drinking a cup because I needed to be al

I didn't quit caffeine. I still drink tea. But I mostly stopped drinking coffee a while back. A few weeks ago, I tried drinking a cup because I needed to be alert/less sleepy, and I felt like shit. Not sure why, headache, some anxiety, and nausea.