20y/o F

occasionally, i get some weird episodes and i'm not sure if they are panic attacks or something else. the episodes generally last no longer than 10-15 minutes, i get really freaked out, my heart rate greatly increases, it causes me to sweat, i get hot flashes, and sometimes a little light headed, i havent been able to pinpoint exactly triggers them because it doesnt happen in just 1 certain place. but i get visions sort of. i remember one of the first few times it happened, i was very young dont remember exactly what age but definatly under 10 years old and i lived on the bottom floor of a 2 story apartment complex.. sometimes when i would hear the people walking upstairs or making any kind of noise on the floor i would get incredibly paranoid and feel like it was going to cave in on me, and i know that sounds really stupid but it wasnt just once, it followed me growing up and i have noticed most often that they occur when im watching television or a movie and i see violence like guns or any kind of weapon, i get incredibly paranoid and feel like whats going on in the screen is happening to me and i envision someone stabbing, shooting, beating, ect. me and i feel like i gotta run out of the building to escape but feel like if i did , nowhere is safe, if i were to go outside i would envision trees, or buildings collapsing on me. these episodes normally dont happen too frequently (approx. 1 every few months) but last summer i noticed they were definatly more frequent sometimes 2-3 a week. i have never been diagnosed with any mental disorder but im not sure ive ever been tested. i saw a counselor once but i never told him about this, i never knew how to explain it before , i havent told many people about it. im not on any medications and i dont use any other drugs. if anyone has any idea what it might be, your input would definatly be appriciated, thanks