This PAIN is horrible!

I was bound and determind to get out and run last night. I am almost craving it, which is pretty foregin to me :-). I tried though and failed and I am so upset. My legs are in SO much pain I just don't know what to do. Guess I should have took some motrin before I left, but I don't want to have to take meds each time I go and run either. I got to the end of my street and I felt the pain. My shin's and calve's are KILLING me. SO bad that because I had to favor them, my back began to act up. Ater having back surgery last year, I get pretty nervous when my I start to feel any type of "pain" in my back. Soreness I can live with. Pain, another story. I kept pushing through the walk though and every few mintues would "attempt" a run. Again, I couldn't do it. the pain in my legs is way too much. I was almost to tears by the time I got home. I ended up walking so very slow and I was even limping the pain was so bad. Does any one have ANY ideas on how to make this stop? Or what is causing it? I have really good expensive running sneakers so I don't think it's my footwear. I don't know what it is, but I am very bummed about it nonetheless. I got home, popped some Mortrin, took a shower and sat down, It hurt to stand. Within about 30-45 mins, the motrin kicked in and i was fine. It's so disappointing to me.

So, needless to say, I am going to skip the race I wanted to do next thursday and wait until the May 8th date. Apparently my body needs me to do that, so I"ll take the advice. I am however welcoming all comments and advice on how to get past this PLEASE!