hi,thanks for query.Put together every thing your symptoms and rash
,it seems that what you are having is possibly a viral fever
.In viral fever rash do appear.Take good amount fluids,juices and soups definitely help.Continue taking light diet.please take fever medications as per need.You can apply lacto calamine
lotion over the rash.If the rash continue to spread beyond 2-3 days,then it is better that you visit your doctor and get your self examined.
wishing you good health.