Hello
Initially you got infection ,either it was a viral or bacterial ,that's why you developed fever ( as you mentioned that started feeling of cold and hot ).
Now you are complaining that there is fatigue , difficulty in breathing , loss of appetite , throat pain , puffy eyes , cough all these symptoms may be due to .
1 Asthmatic allergic
bronchitis , physical examination find out ronchi ( rales or raspy sound as you mentioned ).This is mainly due to
bronchoconstriction .
2 The next reason may be due to
pneumonia ( or consolidation of a part of lung ) as such type of symptoms are very common in pneumonia . Diagnosis can be confirmed by X ray chest .
3
Cor pulmonale is another most common cause . In this condition patient feels difficulty in breathing with
tiredness and loss of appetite .Heart involves with allergy in lungs ( respiratory system) .X ray will find out .But in your case this is a least common cause because duration of illness is very short.
In my opinion consult a G P and get his opinion.
Good luck.
Dr. HET