(Sun. 10/31) 8:10-8:15 pm I was sitting on the sofa in living room, got up to go to the bathroom off our kitchen, turned right and walked about 6 feet into dining room and fainted. I don't remember all of the episode, but my wife happened to be walking behind me since she was going to the kitchen to get something.   My wife says that my legs got shaky and I started to lean against a low server cabinet and put my hands on the wall above it and that she got behind me to keep me from falling to the floor. According to my wife, I wasn't responding to her when she asked me what was wrong, but I came to and still didn't speak.  Then I walked to the kitchen doorway, made a right turn, walked a few feet, and fainted. Mywife couldn't catch or hold me, but she braced my fall onto the kitchen floor on top of the floor mats in front of the sink, and I was completely on the floor. My wife lifted my head, saw my eyes and mouth were open, and was yelling at me to talk to her and patting my face. I came to, said "hi," and got up with my wife's help, but I don't remember this part.  Then I walked straight a few feet to the doorway of the small bathroom (toilet and sink only), and I fainted again, but I didn't have anything to hold onto since the hallway space is narrow. I got spun around and slid down the open door of the bathroom onto the floor and my glasses got knocked off my face. My wife continued to shout my name and yell at me to say something. She lifted my head and patted my face. After I came to, I asked for my glasses, while she was scrambling to pick up some plastic containers that had fallen down from a baker's rack between us.   Then she helped me up and I sat on the toilet. I had made a large loose bowel movement in my underwear, and I went again on the toilet. I was alert, but scared. My wife left me to go upstairs to get clean underwear and pants and a thermometer. My temperature was slightly over 100. I had two more loose movements while on the toilet. My wife gave me some water to drink.  approx. 9:15 pm My wife looked up my insurance company's Nurseline. We told the nurse what happened. The nurse asked many questions, including if we had a blood pressure cuff, so I talked to the nurse while my wife got the wrist monitor.  My blood pressure was 105/63. Pulse was 73.  My wife told the nurse: othe day before, on Saturday, I got my 3rd Pfizer Covid booster shot, and just like the first two times, I felt fine. Just the usual soreness where the injection was on my arm. oI've been taking blood pressure medications for the past 15 years and that I'm currently on 4 meds for blood pressure plus a statin for high cholesterol. osince March of this year, I've been working on losing weight and had lost about 30 pounds (that's due in part to walking and using an exercise bike) oI started commuting to my office part-time at the end of Sept., and had last traveled via bus and subway to my office on the previous Fri.  The nurse suggested that maybe I was dehydrated or maybe the significant weight loss could mean that the dosage for my meds might need adjusting. She recommended that we go to the ER.  approx. 9:45-10:00 pm My wife called 911 for an ambulance, and the two EMTs asked me questions and did some tests on me before taking me to Hospital. My blood pressure was closer to normal. Multiple tests, plus IV.   (Nov. 1) approx. 3:00 am.  Final diagnosis: dehydration and got up too fast from my seat. Sent home, so my wife drove to pick me up standing outside the ER. Instructed to contact primary doctor