I am a 30 yr old woman,I have complex partial siezures, hypothyroidism, and a history of endocarditis + spinal epidural abscess(C3-L5) in 1997, and post strep glomerulonephritis + pulmonary edema in 2003.About 3 months ago I had a bad case of sciatica. what started as some numbness in my right leg off and on, quickly progressed to severe cold/burning pain in my thigh, numbness in the rest of my right leg and weakness ,especially in my big toe area. I was also having trouble urinating. I went to the emergency room and they did x rays,(Normal) catheterized me for residual urine(180 cc's) and drew blood for ESR (30something)They palpated my lower back and when they pressed on the sciatic nerve it was really painful,I didn't have any back pain at the time though so that was a surprise to me. I was told it was sciatica and sent home.I followed up at the clinic the next day and the doc ordered an mri(which would take a while to get approved)I went home and slept for 17 hrs and when I woke up the symptoms were gone. over the next few weeks the numbness came and went and I started having low aching back pain on the right side radiating to my hip. eventually it stopped going away, and then it started waking me up at night(as though I had been laying on it and needed to change position, only to find that I hadn't really been laying on it-it was just a constant ache.)Now it aches worse when resting or lying down, and does not seem to be aggrevated or relieved by any movement or position.The MRI was just approved,Should I still do it though my current symptoms are better than before?