<s>[INST] I have been in a constant state of nauesea for about 3 weeks. In the past 2 weeks I have fainted twice. Both times it felt as though my heart would beat out of my chest and the blood rushes from my body and I lost consciousness. First time grading cheese second time I was in the restroom. I feel like there is someone sitting on my chest get winded standing up and am shaky and of course still nauseated. My BP seems to be low compared to normal about 100/65 hr 82-86. Normally around 135/90 hr 90. I am a mother of 3 weigh about 170 and am 5 5 I am 32. I have a microadenoma and have been taking 88 mcg of Synthroid for about a month for an enlarged thyroid, levels are normal. My cholesterol is 225 and the rest of my lipids are high as well. I am taking ferrous sulfate for a low ferritin count and endomethacin for chronic unclassified headaches. I have a history of fainting but they have never been associated with the fast heartbeat. Was told it was likely autonomic disorder. These spells seem different. Any thoughts? [/INST] Hello There After going through your medical query I understand your concern and I would like to tell you that SEV anemia or cardiac arrhythmia can be a cause for your syncope and is recommended for proper evaluation. Kindly get a CBC, TSH, RBS, ECG, Echo and a holder (ambulatory ECG) done and consult a physician with reports for further treatment. Hopefully this information will guide you properly. Kind Regards Chat Doctor.  </s>