I have been having lower pain with some nausea and mild vomiting also have had a harder time urinating. Went to my local ER and was told there is nothing they could find out of the ordinary. What could this be?  Also about a week and a half ago I went to my family doctor who preformed a urinalysis and was told that my urine had crystals, now today they say there is nothing.
Healthier is nausea, vomiting, lower abdominal pain (side not mentioned as on the right side i.e. appendicitis). You didn't mention the gender, if female patient then pain may be due to ovarian cyst (if patient is young child bearing age)or salpingitis on both side. Such pain in general may be due to these possibilities, these include