Thanks for your reply and information Jerry, what you said has helped anyway though, but will look for other forums to post on as well, thanks again.
I don't think you are not on the right forum for the best answer. Further, I don't know what a HGV is, but assume from your post it is some kind of a lift, e.g., a fork lift.
Strokes are to my knowledge caused by a blood clot reaching the brain. An impact accident of any kind can cause a clot to form, and if it moves to the brain it will cause problems/stroke.
I am not saying the accident you describe caused a clot, I'm just saying it could have. This Community is populated by people, myself included, who have experience with heart rhythm problems. I do not have any direct knowledge or experience with clot formation due to an impact injury, nor have I ever had a stroke.
I hope the stroke didn't cause permanent damage.