Severe mood swings, meltdowns, severe anxiety, & SSRIs cause arousal. Given mood chart & told that might have BPAD. What might it be if not BPAD?

Multiple. hyper or hypothyroid or other endocrine disorders, other types of mental illness, various types of nutritional/vitamin deficiencies or excess, other genetic conditions or brain abnormalities such as tumors. A series of bliood tests, brain scans, personal and family history may be necessary to continue diagnosis.