@inester7 and @
ahimsa Thank you and your answers were really helpful. I added one more question and was curious if either of you had or have tachycardia or shortness of breath either before or after Midodrine?
My tachycardia answer is a bit complicated.
(Edited to add a clarification, probably obvious to most folks, that the term "tachycardia" simply means "fast heart." There are many different causes for this problem.)
I have had one type of tachycardia that first started when I was 11 years old. It is not related to either NMH/POTS or ME/CFS (I don't think?). And my case has never been disabling, just annoying, and maybe a little bit tiring. It has never stopped me from anything. I got my degree, got a full time job in the high tech industry, got lots of exercise (hiking, weight lifting, and so on). I even climbed to the summit of Mt. Hood. Twice.
For me (people can have it to different degrees) this type of tachycardia is relatively infrequent and also a bit random. It might happen a couple times in one day or it might not happen for a few weeks in a row. It might last a few seconds or 45 minutes. Because of this it has never been caught on an ECG or holter monitor. But based on when I first got it, and how it starts and stops, and several discussions with doctors over the years, it's probably
AV nodal reentrant tachycardia. It's like a short circuit in the heart.
Here's what it feels like. My heart is going along normally, say 70 beats per minute. Then on the very next beat it flips into going very fast, maybe 185-200 beats per minute. It usually makes me want to cough, like a reflex in my chest (not in the throat). Then after some time my heart flips back to a normal pace in a single beat, not gradually. This tachycardia never happens during exercise or exertion. It sometimes happens when I bend over slightly, say to pick up something. And a couple of times it has started while sleeping (it wakes me up, of course!).
What's funny to me is that this tachycardia problem sounds very scary to other people even though it's not a big problem for me. My husband completely flipped out the first time it happened. I said, "Here, feel my heart!" not realizing he would freak out. (It was before I had ME/CFS and was completely healthy and fit. But I still had to calm him down--he worries very easily but we were newly married so I didn't realize how much of a worrier he was)
But this minor problem is in no way disabling. It has happened to me at work during a conversation. The other person never even knew. I just excused myself and went to the ladies room until it went away. It once happened while I was giving a talk. I kept on going for another 40 minutes until my talk was finished. As I get older it is more tiring but it's still no big deal. It's nothing compared to ME/CFS/NMH/POTS/whatever the hell combination of diagnoses that cause my primary symptoms.
On the other hand, the tachycardia (POTS) from Orthostatic Intolerance is a problem. It was not so bad on my first Tilt Table Test but seems to have gotten bad enough to qualify for POTS after 20+ years of illness. It is hard to separate my NMH/POTS symptoms since they are all part of the autonomic system problems. In any case, my autonomic dysfunction, however you want to label it, is definitely a disabling problem.
If I'm feeling sick from NMH/POTS symptoms then I can't work. But I've had the AV nodal reentrant tachycardia for 40+ years. I've never even treated it. It does not happen often enough to need treatment. I just sit down, or lie down, until it goes away. Or I try the Valsalva maneuver. Or splash cold water on my face (these sometimes work, but not always).
It's hard for me to tease out every single symptom and figure out whether midodrine helped that symptomm or not. I do think that, in general, midodrine has helped me. I don't know whether I can be very specific when it comes to POTS.
I know this is long, and maybe confusing, but hopefully it will help someone out there!