Hi Michelle, Panic attacks can be caused by many physical disorders like hormonal disturbances, heart ailments, respiratory problems, drugs and medicines among many other. I hope you have been evaluated for all these and has been advised medicines by a qualified psychiatrist. I could help you more if you describe me exactly what are all the problems you have during the attacks. Also I would like to know about any physical problems you are suffering from, any medicines or drugs you are using. you have described about the side effects of the medicine you are using. These could be due to drugs which increases serotonin in the body. I would be able to suggest you the next best step if you tell me the name and dose of the medicine which caused these problems and for how long have you been taking these? Hope to get back the information from you an help you better. Thank you.