Sabrina, yes paxil,like all the other ssri's can cause weight gain. The medication that doesn't is wellbutrin, or if anxiety is the main symptom, klonopin. You should adjust to tiredness within a week, if not, then maybe the dose is too high for you. Re obesity, you have to learn how to stop stress eating, which is probably more difficult for you because of your anxiety. the best way to do that is to take the course at www.shrinkyourself.com, or consult a therapist.