Haven't felt well for a month. Went to ER for high fever, told had random virus but not flu. That was 3 weeks ago. Fever gone then suddenly bad coughing..chocking type coughing. Started decongestants a week ago and still very tired and weak, but also have headache/sinus pressure too. Stuffy/runny nose interchangeable as well. Haven't had good bowel movement and loss of appetite all month long. What is wrong with me??? Happened all of a sudden starting with feeling weak a month ago.