This is the 4th day I ve had a fever of 99 up to 100.4. I m congested, nasal drip, chest cough, headache, neck aches and I m very tired. I ve had to stay in bed pretty much the whole time b/c everything wears me out. I m 49 years old, female, weight 134 lbs. Do I need to go to a doctor? The part concerning me is my energy level & how tired I am.