Hello; I am an Audiologist.
The carotid artery runs very close to the middle ear space, so it is possible to hear your pulse. The more acute your hearing is, the easier it is to hear.
You can hear it louder if you plug your ear with your finger (or lay on your arm) or if your ear is occluded with wax or fluid in the middle ear.
It will also be louder if your blood pressure is high (everyone’s pressure varies throughout the day… when you first lay down at night, of takes a short time for the body to adjust to not having to push the blood against gravity).
It can also seem louder if your carotid artery has a blockage. There are also other serious coditions that cause pulsatile tinnitus.
Therefore, the best thing to do is to have your ears examined to be sure they are clear. Discuss your specific symptoms with the physician, and mention all other symptoms you may have – even if they seem unrelated. Based on that, the Dr. should be able to decide whether you need otologic, cardiovascular or neurological services as your next step.