I got pretty sensitive to it over time, to the point I started drafting sketches and ideas for what essentially would have been a "soundproofed coffin". The concept eventually evolved into a helmet design. But I moved out to a quieter place before actually prototyping anything.

I was similarly disappointed I couldn't find anything premade on the market. It terms of earplugs, I personally find the silicon ones worked best, shoved in tight enough to make a good seal. Sometimes I was able to cram into a contorted position with my arms holding memory foam pillows on top of my head that would further help dampen noise.

Sorry to hear about your woes. It sucks. Hang in there and don't give up. If you're able to consider resituating, don't be afraid to make noise a priority factor for the new location - noise pollution often doesn't get the consideration and attention it deserves, and people who haven't gone through it don't always realize how it can impact your health and break down your mental fortitude.

Finally, if you really are having suicidal thoughts please seek out professional help.

Sending good karma your way; I hope you're able to reclaim a corner of control.