It is possible to have both GAD and Bipolar. However, if both, then it is difficult to judge whether you have anxiety as a result of the Bipolar or if it manifests on its own. I noticed you are from Canada (so am I) so we do have free health care, so I'd recommend you get a doctor's opinion (by psych did you mean psychologist or psychiatrist?) even just at a walk in clinic, if you're having hypomanic/manic symptoms to go and elaborate on it and the doctor there can screen you properly. There are a variety of good books on Bipolar disorder out there, I'm not sure if I can recommend my favourite on here, but a lot of the ones I've read are very enlightening