What Causes Severe Fatigue Along With Nausea And Blurred Vision?

Hi, I ve been very ill the last several days with what seems like cold or flu symptoms (though I ve had a flu shot this year already). While I th Hi, I ve been very ill the last several days with what I assume are severe cold or flu symptoms (though I ve had a flu shot). I m starting to feel a little better after three days of dry cough, mucous buildup, extreme fatigue and achiness, off and on mild fever and chills, some heavy breathing perhaps, nausea, blurred vision. The last two nights I have had extreme night sweats (with the first night I figured it was just the breaking of the fever but it happened a second night after he felt to me the fever had passed already. With in two hours of going to bad last night my bedding was moistened or soaked and my hair was extremely damp. I felt going to sleep I was going to be able to sleep fine finally. Night sweats a second night surprised me. Along with it tonight I have this weird chorus of squeaking or rattling sound upon exhaling only, that I ve noticed only when laying down and only sometimes during the illness. These latter two symptoms I ve discussed I m finding the most concerning. Should I be concerned about the two night sweats, the noises upon exhaling, the whole package of symptoms? Or are they all temporary and common to what has seemed like a very very severe cold and/or flu?