I feel like I am hearing my heartbeat in my ears. It's driving me crazy. What should I do?

What you report sounds like pulsatile tinnitus, which is sometimes due to an increase in blood pressure, but can also be a symptom of other, more serious medical issues. I recommend you follow up with an Ear, Nose and Throat (ENT) specialist for medical assessment.

I would recommend you schedule a diagnostic hearing evaluation with an audiologist and then they can determine if an ENT/Otologic consultation would be warranted following the examination.  In most cases, if it isn't related to impacted cerumen/wax which should be accommodated by the audiologist, a medical referral would be justified. 

See an audiologist and probably also an ENT physician. It could be due to a number of issues from wax clogging your ears enough to make your pulse echo, fluid trapped behind your eardrums, high blood pressure, or something more serious. A thorough look in your ears, immittance testing, and hearing testing may find the reason, and it may or may not need the expertise of an ENT who can order imaging, prescribe medication, or perform surgery if that’s needed. We really do work as a team to figure these things out and try to get that annoying pulsatile sound out of your ears!

You need to see your doctor,  get a diagnostic audiogram done. There could be underlying medical condition.