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:1 Renal calculus, may be on any side. Diagnosis can be confirmed by ultrasound of both kidneys.2 Urinary tract infection, such type of mild pain may be due to UTI. Refresh get in urine culture and sensitivity test.3 Amoebic colitis is another cause of such symptoms, so get in stool examination for enamel history. As you are complaining that there is also nausea and vomiting, this may be due to Hyper acidity caused by lower abdominal pain. So I recommend you consult a gastroenterologist and get his opinion as physical examination is important in this type of cases. If you are a female patient, then consult a gynecologist and get his opinion. Hope this will help you.