First, welcome to NT.

I was in a very bad car accident a couple of years ago and suffered injuries similar to yours: TBI, whiplash, damaged knees, etc…

Whiplash can cause serious, long term neurological damage, especially in people (mostly women) with naturally small outlets. In those cases, it can be difficult to separate the TBI symptoms from the neurological. Either way, you need immediate, specialized medical attention.

See your family doctor without delay. This is way beyond the scope of a GP, so it’s good that he will refer you on. For starters you need to see a neurologist and a physical medical specialist. A CAT Scan isn’t much good for diagnosing brain injury. You should certainly have an MRI and consider neuro-psychological testing to access your brain function.

A lot of your symptoms, like temper and headache, are almost ubiquitous in head injury. Your blackouts are less common - and far more disturbing. By blackouts do you mean that you actually faint or that you suffer short periods of blindness? Either way, please stop driving until you get this problem under control. You of all people know how devastating a car accident can be. You don’t want to hurt or kill yourself or some innocent person.

I could spend a lot of time speculating on which part of your brain is provoking which symptom. The point is that you have a problem and you know it. None of us can say anything that’s going to change that. Please go and get the medical attention you need and the people on this forum will be happy to advise and support you every step of the way.

Good Luck