By explore I believe you mean your father should do a self awareness analysis and the doctors have suggested different approaches. What has your doctor's stated to be the possibilities for the underlying cause of the dizziness.
Does any of the following help? When your father might feel dizziness can be emotional upset, standing up too quickly, motion sickness, nausea, fatigue, tiredness, confused thinking or daytime sleepiness, etc. I believe the doctors want any other symptoms, circumstances or signs your father may have with dizziness. Just to have dizziness does not provide much helpful information. Has there been vestibular test (test involves the inner ear (balance control). Nerve damage. If the condition has been with your father since the surgery, it could be related to a side effect of anesthesia although that usually lasts for a day or two..
Only your father's doctor can help your father sort out what is happening. We can provide possibilities, but that shouldn't be considered a diagnosis.
Thanks for your question, and if you have any further questions, you are welcome to follow up.
Can you describe 'explore himself' in a different way please? I'm not sure what you mean.