flashbacks, guilt, and coping? sorry this doesn

hi. i feel so selfish. i was in a car wreck last year and it put me in a coma. ever since then certain scents, foods, and songs put me in this bad headspace - i don't physically/mentally see or picture anything, but i get this super overwhelming feeling, have a difficulty breathing/start hyperventilating, i start to feel like i'm in that time period again, and i just get reminded of that time. like i said, it used to be certain scents, foods, and songs. are these even flashbacks? very recently, someone in my class got in a bad accident and is currently in a comatose like state and i keep seeing people/her friends post about it and with every post it just triggers that same feeling? i feel so guilty for being this way and i don't know what to do. (of course i don't say anything to them, i just kind of sit there and let the ig/snap stories play in the background or that post just stays where it was.) i have no idea why, but i have a spotify playlist full of songs i listened to around that time, so when i get those triggers i go to the playlist and play the songs. i guess this has been my way of coping, but it does so much more harm than good. (at first, it'd calm me down when id start to feel anxious bc i would smell something that was prominent around that time period now it's habitual) when it gets too overwhelming i pause the song, but the thing is in my head the volume is blasting and it i cant get it to stop or pause. it only gets louder and i don't know what to do.