Hi, I wonder if anyone could help me. Iv been to two doctors who shake their heads and say they are baffled when I tell them my symptoms. The last doctor has booked me in for a brain and back scan. I started with this one year ago, but in the last 6 weeks Iv been having these episodes about once a week. I am feeling fine, then suddenly I get a tingling in my buttocks,feeling as though my bottom is on fire, followed quickly by an ache in both buttocks, which spreads to both my legs. My legs feel weak and like jelly. Iv tried walking it off, but the pain in my bottom just wont go, until I sit down, then I usually feel fine again after about 5 minutes. I have had lower back pain for a long time, but it isnt unbearable, just a nuisance. I dont feel backache though when I get the pain in my bottom and legs. This feeling only comes on when I am walking or standing, it hasnt happened when Iv been sitting or lying down. I had a slipped disc years ago when I was in my 20's and Im now aged 53, and other than this, I feel healthy. Thanks for reading this.