<s>[INST] I am having weird symptoms went to the hospita twice, my normal doctor and nuerologist. All of the test that have been done come back normal.I am having shortness of breath, extreme fatigue, lightheaded and my body feels heavy to the point I have collased . [/INST] Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. These symptoms are suggestive of serious cardiovascular disease, e.g., arrhythmia, pulmonary embolism, heart failure. You need to see a cardiologist. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Anders Mark Christensen </s>