[sethammons]

I was surprised to find out that earplugs can be misused; maybe that is why fingers are more effective than plugs for you. You have to prepare the plugs by gently rolling them (with no wrinkles) into a thinner state so they expand in the ear to form a better seal.

If self harm is a real option, seek help from a professional and/or move. Perhaps sleeping at a friend's house or going camping can provide some relief.