One of the most common symptomatic complaints after COVID-19, vaccination, and now in most persons who have both exposures is POTS (postural orthostatic tachycardia syndrome).
This is a disorder where there is a lack of synchronization between the heart, brain, spinal cord sympathetic chain of ganglia, adrenal gland, and the blood vessels both arterial and venous. The Spike protein on SARS-CoV-2 and flooding the system after vaccination damages neurological tissue, the adrenal glands, and the heart.
The end result can be inappropriately elevated heart rate and either low or high blood pressure causing dizziness. I have seen cases of syncope with facial trauma as a result of this bothersome condition. Kwan et al has shown (n=284,592) that the risk for POTS is substantial, just after heart damage as the highest risk cardiovascular side effect of COVID-19 vaccination….