Well i had my first panic attack 6 years ago (almost 7) it was when i almost choked on my food and spent 1 year surviving off liquids (i was scared to choke on solids and die) i beated my phobia by forcing myself to eat slowly until i went back to normal bu anxiety was still there and i started having panic attacks with my heart racing, feeling dizzy, blurry vision, ears beeping, breathing too quick etc, i developed what is known as health anxiety after 6 months of constant panic attacks thinking my heart was failing, got tests done my health was ok my heart was perfect and well i still have this moments where i notice something in my body that is normal and i think "it's cancer im fucked" or i cough a bit because im a smoker and i think "oh god its covid im gonna die" and like this with EVERYTHING. Today i was playing a videogame and i heard a bird outside my windows but i had a moment of not knowing what the sound was and my brain associated it with "im dying" idk how or why, i wanted to know what could help me with my health anxiety because its really affecting me, ive developed a lot of fears like flying (im scared ill suffer a heart attack, stroke or something on the plane and ill get no medical aid) sport (i feel my heart accelerated and my brain associates it with anxiety) and like this i have a lot of fears, next week im moving to the US and i have 17h of flights ahead of me (which has me terrified) so i was wondering if anyone could give me some advice because atm if my head hurts for a second i automatically think "a stroke im dying" and i associate normal pains or feelings with death diseases or my death. 
I dont wanna be a drama queen but i havent enjoyed life for the past 6 years and im only 26 so its kinda driving me nuts because i really need some advice on how to stop this mindset of always negativity and thinking of the worst case scenario i need to reeducate my mind and idk how.

Thanks