Bipolar disorder is a possibility but I can’t determine a diagnosis based on a short letter. Some of your symptoms are characteristic of depression but some are not, including episodes of “high energy” during which you feel very “productive.” Those symptoms are more in line with mania which is a main characteristic of bipolar disorder. Individuals with depression do not experience symptoms of mania.
Your episodes often coincide with PMS. Another possibility, though less likely, is premenstrual dysphoric disorder (PMDD). PMDD is a more severe and debilitating form of premenstrual syndrome (PMS). If you want to explore PMDD more thoroughly, consult your gynecologist or your primary care physician. You should also discuss these possibilities with your therapist.
I would recommend that you again discuss your symptoms with your therapist. You report that she is not worried but that you are. If you are unsatisfied with her response, then consider getting a second opinion. A psychiatrist could provide that second opinion. He or she can also prescribe psychiatric medication. Medicine can help to decrease the intensity of your symptoms. I would highly recommend seeing a psychiatrist if you have not already. There are many effective medications that exist for the treatment of bipolar disorder. Don’t hesitate to seek all the help that you need. Please take care. I wish you well.