I've had experience with all three of them multiple times. I would suggest you humor him and go see the cardiologist. The worst will be the cardio requesting a EKG or stress EKG. Neither are a big deal. Also great to get a cardio baseline for later in life. I have had three EKGs with the stress element included. It was refreshing to learn that my heart is strong.

The EEG is a simple test. Had many (5) of them over my lifetime. Did he suggest a sleep deprived EEG?

The neuro-psych assessment will be the most important for identifying your condition. Some neuro-psychs have a bias against organic injury from a concussion. This bias can be identified by how they interpret your test results. The key issue with a NPA is the battery if tests done.

The Halsted-Reitan battery is the gold standard for a full battery for mTBI. Some will try to do an abbreviated battery. The NP may do a MMPI-II then interpret it to say you are depressed. This is also easy to overcome. The MMPI-II can be worthwhile if you can get a full report of the results. In fact, a full report of the results will be valuable to understand your symptoms.

Interesting your nuero used the term dyslexia. It is not the correct term for mTBI. The symptoms may be dyslexia-like but not dyslexia.

So, go ahead and get the work-ups done. Relax and just follow the instructions. No need to prepare for any of them except for a sleep deprived EEG.