I notice that you addressed your thread to gimel, but I might suggest that you check your blood pressure. Sometimes when we stand up, especially, if we stand too quickly, we can have a sudden drop in blood pressure which can cause the symptoms you have or a light-headed type feeling.
Adrenaline rush symptoms include:
Rapid heart rate
Sweating
Heightened senses
Rapid breathing
Decreased ability to feel pain Increased strength and performance
Dilated pupils
Feeling jittery or nervous
Causes of an adrenaline rush include:
A threat
Stress
Excitement
Anxiety
Post Traumatic Stress Disorder
Pheochromocytoma (tumour on the adrenal glands)