I'm Having Pain In My Lower Left Quadrant. I Woke

I'm having pain in my lower left quadrant. I woke up with it, and it only hurts (very badly) when I stand up. If I''m sitting, I'm mostly comfortable. I'm 49, female, It has hurt all day when I stand. I'm thinking bowel, although gas passing fine or kidney stone or ovary (g0p0 - negative gyn hx).