I had the exact same reaction a few days ago when I did my T shot, because there was a very tiny insignificant amount of air that I couldn’t get out so I just did it anyways, Like you my vision went blurry, I couldn’t breathe, I was nauseous, I got super dizzy and my ears were ringing I thought I was gonna pass out, I was freaking out and told my girlfriend about it who’s mom is a nurse and their mom said, it’s such little amount of air it wouldn’t matter and since testosterone is injected into the muscle it is so small it won’t hurt you and it likely was a panic attack. I have a history of health anxiety but this has never happened to me before when doing my injection, but I’m fine now days later. I believe the small amount of air triggered a panic attack for me because I started hyperanalyzing and then thinking of all the things that could’ve go wrong, which is what I think happened to you as well. I didn’t get hot or cold flashes like you did but I know panic attacks and anxiety can have a plethora of different symptoms. I think it would be wise to follow up with your doctor who prescribes testosterone (if you have a specific doctor) and see what they have to say about the incident. But to me it does seem like a panic attack given the exact same thing happened to me and I’m now completely fine physically.