convince me it’s just a strain

hi! so i’m a 19 y/o female who used to work a very strenuous job in hospitality but got promoted to a more comfortable role. i guess i got out of practice because about a week ago i cleaned a hotel room as fast as possible and it made me pretty tired but it wasn’t a lot of physical movement. i didn’t have any pain that day or the next, however for about four days now i’ve had pain when breathing (worse with deep breathing) and yesterday it got way worse. i went to work and couldn’t breathe without intense pain then got a weirdly bad nose bleed (that part may just be related to sudden cold weather) and the pain continued only on the right side of my chest when breathing deeply. it also hurts when i put pressure anywhere near the area and i noticed some bruising under my chest, i had side pains as well but i usually just attribute that to the fact that i don’t have a gallbladder/have digestive issues. today the pain has gotten worse/more consistent but i am trying to convince myself that it is just a muscle strain that’ll heal on its own (i don’t have health insurance). does it sound like im being dramatic & it really is just a strain or could this be something more?