Hubby 50, severe hypotension last year with no known cause ever determined. Now occ hypertensive but responsive to meds (takes only one type as needed or gets too low again). Ruled out any cardiac issues, stress tests, echo, EKG etc... hx of cervical fusion and recent lumbar fusion both successful. He has "episodes" where he feels weak, blurred vision, and has a brief slight elevation in b/p. Also has some weird sensation to back of his head (not neck) usually all goes away with complete bedrest. No common factor causing symptoms but is increasing in frequency and length (more severe visual loss as well from blurry, to cloudy to lost vision last time). Thyroid level and blood sugars are normal, perhaps a bit low normal for blood sugars. Any ideas as to what is causing this??? no stress link that is obvious, no real theories from doctors either?