What Causes Severe Pain In Left Abdomen And Lower Back?

was diagonosit sorry spelled wrong backet case just burie my Dad 95 Pearl Harbor Survivor sorry to bother you please forgive me ultra sound cant find right kidney severe pain on left side lower, uterus normal size 7,0x 3.4 x 4.4 fluid seen endometrial canal no discrete lisions are noted. right ovary can t be seen at allleft ovart is seen is 16 x 9 x 16mm. no lesssions noted.no pelvi fluid noted. needs MRI thank you so much Im so sorry to bother you but severe pain left side abnomial and low back. again thin you so much just nervous not seeing him for I think 2weeks