Gosh I hate sudden loud noises too. Personally, I think fireworks I find are okay if (a) you can SEE them (usually they'll be seen just before they're heard), or (b) far enough so the sound isnt crushingly loud. Your situation sounds really icky.
When I was a little kid, the neighbors (well the kids...middle school aged) set off firecrackers every Saturday Morning at 8 AM, like clockwork. On the 4th of July, the parents did it, and it was an all-day thing.
Hope the sound dies down! The 4th of July is meant to celebrate what is right with our country, and how what is right came about. Hopefully you'll be able to celebrate, and not live in nervousness over your neighbors' "celebrations."
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"So when they rolled their eyes at me and told me 'I ain't normal,' I always took it as a compliment"--Katrina Elam