Tilt Table Test

After my stress test showed nothing conclusive, my cardiologist is recommending I take a tilt table test to determine why I have had black out periods lately. My blood pressure was typically 132/78, as of May 2, and my regular doctor considered this number low and desirable. As of May 21, my blood pressure has risen to 134/90 after being taken standing, sitting, and reclining. I know so very little about blood pressure being 43 years old, but I have experienced an unexplained weight gain of almost 40 pounds since the first of the year, and am extremely tired all the time, sometimes sleeping 16 hours per day. Has anybody been diagnosed with chronic fatigue syndrome?