Brief Answer:
Explaining the possibilities
Detailed Answer:
Hello
I am Dr Saumya Mittal. MD
I will try to help you understand the problem you have.
The answer may be a bit complicated cause I will have to use medical terms, but I think you will understand, cause from your query, I think you do have some command on medical terms, like horizontal
nystagmus term you used.
I will start by saying that there are several possibilities.
I will try to explain them to you one by one-
You see the brain is a closed structure. There is a layer of fluid outside and a layer of fluid inside. There may be an increase in the pressure in these positions whenever you assume these positions, because typical to most of your positions is an increased pressure in the chest which makes the blood pump faster. So there is a possibility that the pressure in your csf (fluid in and around brain) is increasing which may cause you to have symptoms like heaviness of head, feeling of beats in the head, mild headache,
vertigo, pressure on eyes and sometimes a tubular type of vision.
I am guessing that as soon as you get up the symptoms become ok, because your pressure is relieved.
As for the problem of getting low blood pressure on getting up, I can say that this is usually almost the reverse.
When you get up, the blood is pulled into the legs by gravity. So the blood pressure may drop. This is usually avoided by compensatory mechanisms of the body, like faster heart beats etc.
In your case the compensatory mechanisms may not be sufficient. So you develop the low blood pressure and possibly the symptoms of vertigo, darkness of vision when you stand and other such symptoms.
Now there are many reasons for this to happen- one of the most common is reduced fluid intake. So make a check of that. Are you having 2-3 litres/day?
I will also suggest checking other treatable causes like sugars and
thyroid, and levels of viamin B12 and
folate.
Now this all is regulated by what is called baroreceptors in your carotids. They are small receptors that take care of your blood pressure and circulation of blood to the brain.
I will suggest you make sure you are avoiding clothes that are tight on the neck, cause they may cause pressure on the baroreceptors causing symptoms- in all the positions, whether squatting, or tip toeing etc, the clothes may be causing the pressure on the neck. So take care of that.
These problems, especially the pressure symptoms are more probable in the patients of valvular heart diseases, like mitral valve or
aortic valve.
Please do look into this. If there is any further query, I would welcome them and appreciate them and try to respond to them.
Best of luck
Dr Saumya Mittal