If you have hypertension it will cause a rise or even spikes. Normally a person who hyperventilates is gasping for breath, not so for the hidden hyperventilators. Unfortunately most doctors do not know to look for this. After 6 years of going down hill to only being able to sit in a chair for at least 2 weeks I found a hypertension specialist that recognized the problem immedately. Amazing, the bloodpressure started coming down and the sack fastened to a short piece of plastic tube is my companion everywhere.
Hyperventilation upsets the central nervous system.
The body needs a balance of CO2 in order for oxygen to be released from the red carpusles. Vital organs are deprived of oxygen and therefore rest of body is deprived of oxygen. Yes, it makes you light headed due to lack of oxygen. There is a simple blood test doctors can do to determine the level of CO2 blood gasses. However, you will have to request this test, it is not done on a routine basis.