Ask Health Experts and Get Answers to Your Health Question ASAP
Black stool can occur when people take bismuth products like Peptobismol, iron supplements and charcoal products. This is entirely harmless.
However it can also be a black or tarry stool when there is bleeding in the intestine or stomach such as with an ulcer and so new-onset black stool (especially if loose) is a reason to see a doctor as soon as possible. Any stomach pain then go straight to ER.
Although the black stool is most likely due to the peptobismol, I would recommend that you see a doctor to investigate the burning sensation in the chest. It may be that you would benefit from a medication to reduce stomach acid such as omeprazole however you may need an upper GI endoscopy at some point to check for ulcers or gastric irritation.
Adrenal fatigue is not a diagnosis that we commonly use in medicine. If your adrenal glands were not functioning then you would have a wide number of symptoms and blood tests would be able to clarify this.
Anxiety and panic attacks are very common and usually represent a mental health issue rather than a physical abnormality. Your doctor can request test for catecholamines if you wish to investigate this as a possible cause.