I buy earplugs in bulk - much cheaper that way - and wear them night and day. I use paper, plastic or melamine crockery (bliss! No awful clatter of cutlery on plates) and wooden or plastic spoons. The computer sound is permanently muted, and I watch tv with earplugs in and headphones over the top (so I can hear my tv but not the neighbour's). The vacuum has been replaced with wooden floors that I clean with a broom. The microwave that shrieked whenever I pressed anything is in the shed, sans plug. I leave the batteries out of the doorbell when I'm not expecting anyone and the phone switched off in a drawer. All of the above helps, but if some dear soul bangs on my front door with a fist I am tempted to do murder, and I have to seal myself in the bedroom while the washing machine does its impersonation of a Jumbo jet taking off.
It's not easy to find ways of coping, but never let anyone make you feel that you 'shouldn't' be like this. I was born like it. I'm not being awkward or dramatic. It's a disability, and therefore my responsibility to find some way of living with it. But dear God, yes, sometimes you just want to take a gun and shoot everything that makes a noise :)