I've used my arms quite a few times now and not had too many issues, about 2 weeks ago I'm sure the cannula was hitting a nerve, muscle or tendon as it hurt when I moved my arm suddenly or when lifting anything so may have positioned it wrongly, even when I removed the pod it was sore for a couple of days so something wasn't right.
What I find when wearing the pod on your arm is to wear a tubular bandage or arm band over it to stop it moving around, nothing to do with the adhesion as I find the pod stick like glue and take some removing once you have to do a pod change but with using my arms a lot I find that even though the pods are light they can drag on the skin, so by wearing a bandage/band this stops the pod moving and holds it close to the skin.
I'm just wondering if you positioned the pod on a site where you have poor insulin absorption if your blood levels went sky-high, I've have absorption issues from over-using the sites when on MDI and have to be careful where I position the pods much the same as I had to be careful where I injected before moving to a pump, the bleeding when removing a pod is something I've had on a few occasions but I believe this can happen when removing cannula's with insulin pumps so don't think its anything to worry about.