It's much more important to address the underlying cause, and only an ENT specialist can do that.
The other users have already mentioned several possibilities.
It could also be related to a narrow ear canal, which can be particularly noticeable at lower frequencies. Narrow ear canals are also much more susceptible to infections, leading to slight swelling.
I would guess it's several small causes that are unfortunately cascading together.
You could try using a strong decongestant nasal spray, leaving it in for half an hour, to see if that helps.
But that's not a solution and doesn't replace seeing a specialist. I would also advise you to see an ENT specialist as soon as possible, because if it's an inflammation, it's important to get it treated quickly before it causes damage.
You definitely don't need to replace your devices, but if the problem can't be completely resolved medically, which I wouldn't expect, then a well-tuned PEQ should help.