I normally have slightly low BP (a nurse once asked me to guess my PB and I said 115 over 75) Lucky, guess as she showed me that's what it was. I too have had dizzy spells especially when working at the gym. I was told I needed more hydration. Because of the low BP I am prone to go into shock easier but things have gotten better as I age. A slightly low BP is much better than a high one.

Sorry that happened to you. I take a blood pressure med that puts me right where the doc wants me. I'm also always drinking something. 7-up or Sprite seem to work. Since I walk in special shoes and my feet tend to go to sleep, I keep a 4 pronged walking cane close by if I am sitting down. Stand up slowly to see if anything is asleep. This keeps me from falling and I have stood up quickly before and fallen right to the floor. As a computer nerd I sit for long periods of time. Posting this coz some of it might help you too.

Oh wow. I'm sorry that happened to you. I have the opposite problem, my blood pressure's dangerously high. It's affected my kidneys. Years ago my blood pressure dropped from unregulated meds and I experienced "hypotension". It was scary. I hope you can keep yours under control. Be careful out there my friend.