What Causes Body Ache, Appetite Loss And Nausea?

My 29 year old daughter has achy flu like symptoms for several days. This follows passing kidney stones 2 weeks ago and being on antibiotics for a urinary tract infection. She s been able to eat very little, nauseous, and vomits most of what she does eat. She s finished with the antibiotics, but still in great pain. She still has her prescription anti-nausea medicine (dissolves under her tongue), which helps somewhat. She s taking ibuprofen for pain. She now has indigestion-type symptoms, which may be partially due to inability to keep much food or water down. Help please!