Doc said everything was fine. Should I find a new doctor?

Find another doc, asap.

However, it's hard to find a doctor that has a holistic approach within the mainstream medical establishment.

I was Experiecing the same symptoms as you are "brain fog", fatigue, among others for quite a few years, despite what I believed was a healthy lifestyle.

Although, he may be correct in some way about the brain fog may not specifically be caused by Low Testosterone only, it is definitely an important contributor. Brain fog is a "non-specific" symptom that can have many causes, but the most common one is low-grade inflammation caused by a variety of triggers, and having optimal hormones is definitely a key factor in dampening and turning off the inflammatory processes that lead to brain fog, fatigue, insomnia and so on, and help you stay young.

For your age, your LH, FSH and T are pretty low. Are you on any medications for any reason? Some antidepressants and other types of meds can cause issues with LH and FSH which consequently will lead you to having other hormone inbalances.

Your TSH is great, however you may also request from your doc to run a complete thyroid panel with "thyroid antibodies" included. Sometimes having a higher antibody count may signal issues with your thyroid, even though your TSH still looks great. If the results are normal, then you can "rule out" beginning stages of thyroid autoimmunity as a cause of brain fog and move on the sex hormones. https://youtu.be/OQvQV09gSfg?t=1m59s

Talk to your doctor man, and good luck

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