Hi Athene, My girlfriend is having the same problems with blood pressure fluctuating rapidly, and also high blood pressure, and high heart rate. She is seeing a naturopath and the suggestion was made that a hyperactive? thyroid may cause some of those problems. However, it's unclear if they have nailed that down as being the problem. If anybody has some suggestions for things to try for the blood pressure and heart rate I would be grateful for that! On vitamin C, I heard that vitamin C does not last long in the body. It was suggested sodium ascorbate powder in water throughout the day may help keep that up. The special form of C is so you don't ruin the enamel on your teeth.