Pains while running?

[LightsOut]

I recently started jogging (day 6 now) and while I am noticing I can run farther already w/o breathing too hard, i'm having to stop b/c my lower back starts to tighten up and hurts really bad while I run, so much so that i'm forced to stop my runs short and start walking. However it doesn't stop there, the last 2 days when I stopped my run due to back pain and started to walk, the archest of my feet started cramping too making it extremely painful to just take steps. Are there any explanations for this, I stretch regularly but am I not doing the right ones? TY for the help guys.