This is a good question. It is very important that you make an appointment with your primary care doctor
to discuss your symptoms and have a full history and physical. Depending on what your doctor discovers during your visit, he or she may order additional testing such as blood work. The symptoms you are describing can be a sign of many different medical conditions, many of which the ER would have ruled out, such as a heart attack or pulmonary embolus. Make sure to ask your doctor if the ER tested your thyroid levels, as hyperthyroidism can cause palpitations, dizziness
, high BP, weight loss, etc. The bumps in your mouth are likely unrelated to what is going on otherwise, however, make sure you point these out to your doctor. Anxiety often manifests in many physical symptoms. It is also often characterized by stress, mood changes, depression, insomnia
or other changes in your sleep, appetite changes, and heart palpitations. Again, it is very important to seek medical care as soon as possible to get a correct diagnosis and obtain appropriate treatment. In the meantime, avoid caffeine and alcohol as these can worsen your symptoms, and try to drink plenty of water and get plenty of rest.