I don't know if this has come up so far, but here's what I've noticed.
My normal blood pressure is 110/70. If it falls down to 100/60, I have such a bad dizziness. It usually happens in the morning and at 3pm, i have to drink liquid to raise my bp. If I drink too much liquids, my bp rises to 120/80, and I feel bad, I feel sick and want to vomit.
These symptoms are quite typical for bp diseases, but I think I am very sensitive to the smallest fluctuation of the bp. Has anyone else felt or measured this?
However, I think that it shows a link between MS and the blood system.