caregiver222 is 100% correct! you need to see your doctor for a complete workup!!
I would suggest that you do not belong in the military services. Nothing to be ashamed of. The etiology would be increased blood pressure secondary to the sexual arousal. Then there may be a problem with a developing aneurysm. Or an enlarged left heart. You need a neurological evaluation, and a cardiac evaluation (chemical stress test) with an MRA (dye contrast) MRI. In addition, this problem must be brought to the attention of the military physician who will evaluate you before entering active duty. There is a distinct possibility that this is a yellow flag for a potentially life-threatening situation.