Had an ultrasound last month but she couldn't find the left ovary (MIA) and other than that, the rest of my insides looked fine. Yet, since about 3 cycles ago during ovulation, my sciatica has flared up horribly, the most when I ovulate on the left side. it's to the point that the back pain continues throughout my cycle daily, just at a reduced pain rate. Of course, I'm worried about all possibilities. I'm 45, have two children and had one (the left one) tube removed due to an ectopic in 2002. Anyone else have severe sciatic flare up during ovulation??