Best headphones/earplugs to drown out loud nearby conversations
I'm distracted by noise myself. Mostly because I'm hard of hearing. Have been since I was a kid. I can hear tones and whatnot just fine. But when it comes to conversations or trying to work I have a tough time because my ears pick up everything. I would like suggest trying focus exercises or games like the ones on Lumosity. A few of those games are to help you with attention to help avoid distractions while working or driving. You only get 2 weeks free. If you like it you can then pay for a subscription or otherwise cancel it.
If you go the headphone route and want to play music (some people need a little sound) I sugget playing music that won't distract you like classical or something. Something you can drown out.
Do keep in mind wherever you use your headphones with or without music, if an emergency takes place you might be in trouble if you don't set in place some kind of safety failsafe.