When you start and stop a medication which alters chemicals in your brain, it is a guarentee that you will feel some effects. Its normal. You just have to decide if the 5-7 days of a little discomfort is worth it for feeling better in the end. I am also taking an ssri for anxiety. I was perscribed it because the chemicals responsible for cause depression are also responsible for causing anxiety. If the chemicals in your brain are in-fact, out of wack..then an ssri should help. I take a benzodiazephine on an as-needed basis.
Ask your doctor why he is putting you on an SSRI and not a benzodiazepine? Anxiety is your issue, not depression.
Hope you find a peaceful place and work out if the medication is the best for you. Did you tell your doctor that you had stopped taking it before?