Before making any comment, let me say that I certainly advise you to speak to your PCP with this exact description of your concern. IMO, the details you give, should not be left to a guessing game by non-medical individuals.
Having said this, ii3rittles, You describe the sensation of blood rushing to one's head, which can have numerous causes and explanations......anxiety, certainly being one of these. The slight "hearing" alteration occurs, more than likely, due to your heart beat ECHO becoming more audible in your head, which may drown out other noises within your hearing range.....not that your hearing itself has been compromised.
An episode of this nature would easily cause dizziness and a light head......thus making you feel faint. Experiencing these various sensations can only prove to increase your anxiety and naturally, exacerbate symptoms.....like the cat chasing it's tail.
Until you are able to seek medical attention for this through your Dr, you might want to try taking control of these incidents as they occur. I would stop what I am doing and if possible, sit down and begin very slow, deep breathing, inhaling to capacity and releasing the air through pursed lips until you feel your lungs have emptied. Close your eyes and focus on what you are doing, and not on what may have caused a rise in your blood pressure. Stroking or massaging your neck does help because you are somewhat slowing the rush of blood to your head....Sip some water if available and do not resume activity until you are feeling much better.......Do this each time this event occurs.. SEE YOUR PCP. and Good luck. (FYI, I experience much the same sensations on occasion, due to an electrical issue I have with severe heart arrhythmias.)