Go away,
Thank you for your post. First of all, have you heard of fibromuscular dysplasia (FMD)? In particular, you should read about renal, carotid, and vertebral FMD, although FMD can be in other places, including the heart.
I agree that, during blood pressure surges, the headaches are so severe that I can't bear them. The headaches are solely caused by the high blood pressure, because they go away when the blood pressure goes back near normal. The pressure goes so high that I often am nauseated and have "severe" (it hurts!) pain in my heart. I have a lot of flushing in my face, neck, arms, and even feet and lower legs. Both eyes are completely blood shot, glassy, and sunken in. I look so sick that I look awful, and this routinely occurs when I'm in a meeting with several other people at work. I'm not able to stop what is happening to me. It is very embarrassing and difficult. Having a surge in front of a table full of people who don't understand, is very hard, and I'm tired of it. It is jeopardizing my job.
I too, feel "underwater" at times, when my blood pressure falls because my hearing is instantly reduced by at least 50%. It falls after I've stood up and taken about 7-8 steps. When it falls, I'm unable to stand up staight, walk, or talk, and have to put my head down on a countertop, furniture, or against a wall, because my brain seems to "stop" and I'm too weak to stand up. I can't do anything. I believe it is due to a lack of oxygen in the brain due to the blood pressure falling. This commonly happens 8-10+ times per day. Some days are more severe than others, but it is tiring to continue to live this way.
I have found that Nifedipine will quickly bring down my blood pressure when it surges. Nothing else will do so. I don't go anywhere without it. I actually bite the capsule to get the "juice" out it, as that works much quicker. When my blood pressure is at 230ish, causing me to feel sooo sick, I can't bear to have it that high, so I'm willing to do anything to get it done. My concern is the potential damage the etreme high and low blood pressures are doing to my health long-term. A couple of times, it has gone to 300. Once it went so high that it cut off my breathing and caused a grand mal seizure for several minutes. Have you read anything about long-term effects?
It's interesting that you mentioned an antihistamine. For almost a year, I've experienced an instant "all over flash" sensation the first moment I wake up and go to sleep. I don't understand why it happens, but it is very intense and uncomfortable. Its like a sudden chemical release that's released at one time, all over. I don't know if this is related to baro. or not. I going to take an antihistamine to see if it helps. I am also intolerant to temperature change. Heat makes my blood pressure surge, and often very cold temperatures do as well. I literally can not tolerate heat or cold, as my body temperature seems so dysregulated. I am constantly trying to cool off or warm up.
I also have Adies Tonic Pupil, which the Mayo Cinic surmised may be the cause of the baro. It is believed ATP may be caused by a virus, which could have damaged the nerve that the baroreceptors communicate with. Do you have any size difference with your pupils?
I have not found a doctor in the USA that has been able to help. Most of the doctors know nothing about it. However, there are a handful of autonomic doctors that do, in different parts of the country, but they are hours from where I live. The doctor that actually identified baro. said he wasn't sure if I have baro. because I haven't had a neck injury/surgery. Yet, he didn't consider ATP. Whereas the Mayo specialist did, and diagnosed me with baro. Developing baro. due to ATP is very rare, hence, my struggle to find a doctor that is able and willing to help. In the meantime, I still struggle each day. I have to work, eventhough I'm truly not able to, because it is so very debilitating. Are you able to hold a job with this condition?
What are the "triggers" that cause your blood pressure surges? Just talking about my blood pressure is a trigger for me. I believe this is because I have struggled so hard with this condition, for 14 years, that it has been traumatizing to me, to the point that it's hard to discuss it.
Again, thanks for your information. It helps to read what others are experiencing with this condition.