I too have been experiencing horrible side effects from this drug I started taking on Monday(It's now Saturday) of this week. At first I thought it was some kind of reaction between the flax seed that I take in the morning and the drug so I eliminated the flax seed in the morning and just took the Doxy well same symptoms(head, dizziness, light headiness, moody) still there so I decided to research online to see if these were possible side effects. First I came upon a medical site and there was no mention of my symptoms and then I begin to get worried that maybe I was sicker than I thought but I decided to dig a little more and came upon this sight. I was shocked to see so many other people experiencing some of the same symptoms. I will not be taking this drug again. I have kids and been totally useless to them for the past couple of days because it. Something needs to be done about this. I wonder if this is happening with only the free dosages?