I had a cannula in my arm 2 weeks ago. When it came out there was some pretty nasty bruising which has mostly gone, but a new bruise has appeared and I have 2 very sore areas where the veins are really hard. It's still quite painful 2 weeks on. I know there can be trauma to the vein but should it last this long? I'm being totally paranoid and worrying that there's something still in there or something wrong!