I have been having low blood pressure-- consistently below 100/80 and often below 80/70-- over the last week. I am doing OK in the mornings and early afternoons but by late afternoons am tremendously fatigued and I assume this is the BP getting to me. I have recently been thoroughly checked out by a cardiologist and have no heart problems. Currently I am awaiting a facet block procedure for my spine, which will take place on Monday, and for the last few weeks have been taking Norco for the pain of the spine and sciatia. Could this be causing the low BP?