ROAD TRAUMA TRIGGER. not graphic but don't read if your anxiety is due to a car/truck accident

Hi guys and gal's, excuse my poor grammar and novel length post im really struggling as of late. 

A little bit about myself. 
27yo healthy male, truck driver not grossly overweight or unfit, don't smoke anymore, barely every drink, eating clean as of the beginning of my health scare 6 months ago and wasn't to bad before that diet wise. Been an anxious person all my life but managed to get it pretty well under control, can almost say 100% under control. 

Had 2 traumatic events on the road mid to late 2021, one a truck hit the back of mine and the bloke lost both legs, watched the fire brigade pull him from the wreck, second one involved my father being hit by an oncoming truck while driving his almost losing his right arm, sat with him until ambulance arrived. 

I'm almost certain these two events coupled with running the family buisness on my own contributing more stress, and lockdowns, (I'm in Australia)  have triggered my anxiety, which in turn brought on chest pain from pretty bad reflux, (which I guess stems from anxiety aswell) I overcame the reflux with meds from my doc, did ekg, cardiography and a stress test to rule out heart problems with the chest pain, blood test and the rest all came back clear. 

Ever since the chest pains, I've been paranoid about my heart, and any other silly sensation I get, left arm pain, left leg pain, weird headaches in pinpoint spots that are a 3/10 pain wise but in a spot the size of a 5c coin in different places on my skull, all have me convinced I'm dying. 

My logical brain is pretty sure I'm fine, seeing I can run for 1km and I'm fine, but the stress of the "what if" and constant symptoms all day every day for months is slowly grinding away at my state of mind, in turn making the symptoms worse in a big loop feeding itself. 

I find myself down, unmotivated to do something with the spare time I get from work, moody, and I'm worried if I let this continue I may slip into a habit or loop I can't break. 

What have people done to snap themselves out of this 😔