Welcome to HCM
As you have suffered a episode of food poisoning/Gastroenteritis
because of virus? I hope that part is OK now ,but as it causes dehydration
along with loss of electrolytes makes aperson weak and bodyache may be part of viral or imbalance of electrolytes.
Treatment should be replenish all the fluid and electrolytes if vomiting
is not a issue then Oral rehydration fluid should be best.About rash if it is itching a OTC anti allergy
Natural coconut water buttermilk and if bodyache is too much a paracetamol
on As and when required basis may be taken but if dehydration is more and any problem with urinary output one must visit ER and condition should be assessed by Physician and treated accordingly.