Summer is coming and the neighbours are getting loud

I love to garden, but the neighbours i the street over the hedge where several houses back on to our garden are getting ever louder, loud to the point where I don't want to be out there at weekends, after school and in school holidays, it feels to stressful with competing music from different houses, people shouting and talking and kids shouting and screaming. It's making me want to move house again, but thats not possible yet.

I've had noise cancelling earphones sugested to me, but have then been told that they cancel background noise but not speach, whats the point, thats what I don't want to hear? The other problem I have with headphones is that I have PTSD and if someone comes up behind me, I jump so bad I have a massive adreniline overload, followed by exhaustion and feeling upset, weepy and horrible for the rest of at least that day.

I dont' xpect anyone to be able to help, I just want to let off steam at feeling unable to use my garden on what has been one of the best days of the year so far weather wise.