Check the CDC web site for Vaccine Adverse Reactions for this year's influenza strain. We have given several hundred in our office so far this season...no problems yet. That does not mean their won't be problems, but our experience has been uneventful. My concern is not the vaccine; my concern is the skill of the person giving the injection. An improperly placed injection; too close to a nerve, can cause neurological issues for sure. Please see your medical provider (or a neurologist) since it has been five weeks for you.