Try Mack's silicon earplugs.
they are not to be placed inside the ear canal
but only to cover the entrance from the outside.
so no unpleasant pressure, no heart beating etc.
using them for years.
You can also get custom fitted earplugs from an audiologist. They are wonderful. Extremely comfortable and they don't press on your ear canal, so you don't have any pain or hear your heartbeat, etc.
