Check out the question about blacking out for 1 to 5 seconds. Lots of input there. I developed tachycardia that was causing me to black out. I had a heart ablation last year and now the brief tachycardia causes almost no issues. It used to go on for hours.

I too have had low blood pressure and tachycardia. I have had a lot of tests run, without a definitve diagnosis. It has been blamed on meds, allergies, arthritis, etc. No one seems to know. I wish I could help give you more answers.

Did you ever get a diagnosis?

Mine tends to be 85 to 105 over 50 to 70. They keep insisting it's fine. But whenever i feel bad or have seizure, it's always low. Head ached ears ring. Frustrating when they keep telling me it's fine. They literally sent me home from the er 2 wks ago after having my third seizure of the morning. The last one lasted 30 minutes in front of er doctors. They sent me home with bp 83.55. All i can remember is holding me head and crying all the way huge. Ended up back in er, and over night on observation, with 2 infusions of Dilantin.

Low blood pressure and tackyarcadia and have had only 1 seizure but lasted for 30 mins