Lower stomach pain can be caused by many diseases including ureter infection, appendicitis, diverticulitis
, uterus inflammation, ovarian cyst, ovarian inflammation
and even ectopic pregnancy. Association of dizziness, painful urinating and hot flashes (caused probably by fever) points to urinary tract
inflammation. However all others abdomen diseases should be ruled out. You should have blood tests performed for inflammation signs, urine tests, pregnancy tests, abdomen ultrasound and transvaginal ultrasound
. Other tests might be necessary (like abdomen CT) depending of previous tests results.
Hope this will help