Brief Answer:
Highly likely you had orthostatic (postural) hypotension

Detailed Answer:

Hello,

It is highly likely you had orthostatic (postural) hypotension.
In PCOS hormonal changes (androgen excess, anovulation and insulin resistance) in the body causes autonomic nerve dysfunction: especially vagal nerve gets affected which controls heart rate. Therefore women with PCOS experience often postural orthostatic tachycardia syndrome (POTS).

In POTS you should experience increase in the heart rate more than 30 beats per minute with the change in the body position from supine to standing without significant change in the blood pressure. But there was not significant increase in your heart rate but there was significant decrease in blood pressure which suggests orthostatic hypotension.

When you are standing up from a lying down position or seated position your blood pressure drops because blood is pooled in the legs because of gravity forces. Your body should adjust blood pressure by increasing heart contraction forces, heart rate and constricting blood vessels. In orthostatic hypotension the body is unable to adjust blood pressure according to the body needs and it drops to that level that causes loss of balance, dizziness, weakness, headache, feeling tired, etc. These symptoms don’t last long and often goes away after sitting down for a while.

Orthostatic hypotension may also be caused by autonomic nerve dysfunction, hypovolemia or dehydration. It is common among younger females.
Try the following life-style modifications: increase fluid intake rich in sodium and potassium, decrease alcohol if you drink, avoid situations that trigger symptoms, such as abrupt postural changes, prolonged recumbency or standing for long periods.
If the above life-style changes will not help, and you continue experiencing the symptoms hypotension may be a sign of another medical condition. See you doctor for thorough health examination and tests.

Hope I have answered your query. Let me know if I can assist you further.
Thank you

---

Brief Answer:
Body position changes while lying down may cause hypotension

Detailed Answer:

Hi,

Yes, even changes in the body position while lying down may cause hypotension. I assume that you are not taking any medications.
Please, continue every day blood pressure measurements and record the values in your blood pressure record book.
As I explained autonomic dysfunction in PCOS may be responsible for orthostatic hypotension and orthostatic tachycardia syndrome. If you get proper treatment for PCOS both of the syndromes may get resolved.

Please, feel free to ask me if there is anything else you need to know. I will be happy to help you further.
Thank you

---