I found that following my concussion, running would significantly worsen my symptoms because my head was so sensitive to any jolting that it was like I was getting banged on the head with each step.

Although the blood pressure thing is very uncomfortable I don't think there's a risk that a vessel will burst or anything. That would basically be a stroke, and I haven't heard anything about increased risk of stroke following a concussion.

If I were you I would do the test but I would only walk on the treadmill, not run. But I am not you and your symptoms will be different, so it's up to you obviously.