i was waken by a loud high pitch piercing nose in my head. i woke up and i keep thinking please go away. after a minute it did my i felt like i could feel my heartbeat in the back of my throat. i got out of bed. i was not dizzy or in pain. i put my earplugs in hoping the heartbeats would go away. it took about 30 to 45 mins. for it to stop. anymore the heartbeats in  my ears are normal. i have been trying to deal with it. my age is 53 years old my job is very stressful.
Hello... After your details it is unclear that these symptoms occurring with you only one time or these are occurring frequently with you. If these symptoms happened once after loud noise then it is perfectly normal phenomena. Do not bother about it. It is a pure physiological condition that heart beats suddenly becomes fast and loud after hearing noise during sleeping because of sudden release of epinephrine and nor-epinephrine hormones. But if these symptoms occurring frequently with you in seeping condition as well as in awaken condition then kindly consult your physician regarding this. It may be Panic attack with Anxiety disorder or maybe you are suffering from some heart pathology. Thank You.