Maybe a renal colic?
History of kidney stones esp. in the summer + little water, elevated bp & temp (but could be from distress), intense pain, hematuria, vomiting
If you take the dehydration and history of the patient into account, that means possibilities involving kidney stones should be gone through first.
These symptoms, while also taking into account the history of kidney stones at this time, mean that the patient could have a renal colic caused by a kidney stone.