From the description of symptoms it sounds like
pityriasis rosea. Pityriasis rosea is a common human skin
disease which presents as numerous patches of pink or red oval rash. The rash may be accompanied by low-grade headache, fever, nausea and fatigue and sometimes by itching.
No treatment is usually required. In most patients, the condition lasts only a matter of weeks or months(upto six months).
If the rash persists then it will be best to get it evaluated from a dermatologist.