Hearing issue

It's likely your respiratory system around your middle ears and sinuses,. etc. I can experience similar pusatile sensations deep in my ears during and after heavy activity in hot weather with allergies acting up. It's worse leaning forward and laying on my side.

The nearby arterial heartbeat pressure sounds may increase if your middle ears have excess fluid pressure that's not draining through your eustachian tubes. You may need to port those sub's with a decongestant after a medical exam ! Squish, squish squish...hope your much better soon.

As the fluid builds up around your ears it can amplify the sound of your heartbeat. You can get the same results from inverting yourself so even a subtle buildup of pressure while trying to sleep can make your heartbeat all the more noticeable and annoying.

I had an ear infection that led to a bursting of my inner ear drum which leaked the infection onto my pillow (eech!) The infection came on late one afternoon at work so I went to the doctor who thought I was high on something because my equilibrium was off which made me very shaky. It wasn't until the doctor took a look in my ear that she put me on antibiotics (oral and eardrops) but it was too late. Right before the bursting of the eardrum there was that rushing sound you spoke of that sounded like a jet was taking off and then boom, leaking ear.

It had no lasting effect but it's something I wouldn't want to go through again so take the advice given here and use that ear wax removal kit regularly and good luck on your doctors visit.

All the best,
Nonoise

Some earwax is necessary for damping specific frequency oscillation within the ear canal. I noticed this after a doctor’s somewhat rigorous cleaning. Took a few weeks for the effect to diminish.

I am a retired Internal Medicine doctor.  Besides all the ear problems mentioned above, a more sinister cause of this sensation can be the carotid artery pulsations being transmitted through bone to the middle ear.  Most of the time this is benign, but potentially could represent an aneurysm in the artery, putting the aneurysm in contact with bone with which it previously had none.  The odds are that this isn’t what is occurring, but ear wax is a lot easier to deal with than a stroke, so see your doctor and have an ultrasound of the carotids.  It’s a nothing painless test that takes 10 minutes