5-th day on 100mg Imuran, SEVERE back pain. Please help :(

It's 10AM over here, and I just woke up. I am in so much pain I needed help to be turned to side to write this message from my laptop. The pain is too high to be kidney related (I had kidney pain before, and it's nothing similar), but it can't be really characterized as upper back pain. Its somewhere bellow my shoulder blades, on both sides. It hurts the way when you throw your back out, and it started yesterday, but it didn't hurt nearly as much. I am certain it's not injury or kidney related. I am scheduled for blood works tomorrow when I will see my doctor. Should I wait, try to drag myself to the clinic right away, or just send someone for pain killers prescription, and try to rest? IT IS UNBEARABLE!

I called my doc, and he said that based on my symptoms, he thinks it's not pancreatitis (no nausea, no pain when pressure is applied). He told me to take paracetamo, which I did, and I feel a bit better, and call him later. What I fear the most is pancreatitis. I am not ready for additional complications, and searching for a new therapy.