It is hard to say if your symptoms are a result of the birth control or a viral illness. Time will tell. Dizziness is a side effect of Levora. If the symptoms do not resolve within a week, it may be the contraceptive. Weight gain is also a possible side effect however simple science stands true. If you consume less calories than you burn off, it is impossible to gain weight. Good diet and excercise should be able to combat that side effect.