Recently, after 10 months on NXstage using button holes, I am experiencing an aching and buring pain at my access sites and my blood pressure begins to lower rapidly causing me to quite my dialysis treatment anywhere from an hour to 15 minutes early. Has anyone experience this and is so, what can be done about it. Do you know the cause. It makes me nauseous, and feel as if I'm going to pass out. My center says they've never heard of this but I can't believe it's never happened to anyone else. They want to start new button holes but I only want to do that as a last result. My needles have always hurt going in but it only lasts a few seconds. Help if you can. Thanks. WD