((((dexter)))) I'm sorry you are so vigilant. I know where you're at, and it's not fun. I have to turn the tv up loud, or put on the "mind eraser" cd (as my T calls it) to not be so jumpy at loud sounds. I have menieres, so the sounds have to be loud.. like THUNDER!!! grrrr with a t storm, I have to have the lights on to deflect the flashing outside. and the tv... but my neighbor WAS digging in the yard a short time ago, and with coral rock...it resonates for the whole block!
Take care, it is what it is. Don't beat yourself up about how you have to cope. It's ok!