One possibility is that sometimes, due to the short half life most of the ssris and snris have in the body, a person can experience withdrawal symptoms before the next dose is taken. Electric shocks are a common withdrawal symptom. Another possibility is an adverse effect on magnesium absorption, as these drugs use the same pathway to the brain used by magnesium. This means if taken near the same time, whether in food or supplement, magnesium can block the effectiveness of the drug and vice versa. Because magnesium is responsible in part for relaxing the muscles and the nervous system, a common side effect of these drugs is muscle cramps and nerve pain. Now, you're on a beginner dose of the med -- the recommended dose for anxiety is 10mg -- and this might go away, but after 2 months probably not. If you can't tolerate this, there are two things you might try: try taking a magnesium citrate or taureate supplement and see if it helps (take it hours apart from taking the med), or try splitting the dose in two so you don't go through any time without some in your system. That will be difficult with just a 5mg dose, though.