This is the problem with prescription medications for anxiety- they can produce numerous side effects which can severely affect your life. You need to speak with your doctor about the side effects you are experiencing with Zoloft (sertraline), as sedation, dizziness, and headaches are commonly seen with it.
If you want a natural solution to your anxiety, then consider taking KalmPro, which was formulated with natural ingredients, not those synthetic, chemical compounds (prescription medications) made in the laboratory.