I agree about the B12.... don't change anything there.

Doctors have "learned" to follow lab ranges, like blind men.
Even though they don't understand the ranges or how old they are or how they were developed.

Just because you were flagged high doesn't mean ANYTHING negative. It does mean you are absorbing the B12 and that is the only significant feature of that test.
There is not ONE study showing high B12 is harmful on PubMed over many many years in many countries. Our own FDA has no upper limit on B12 intake for this reason.

So your doctor is probably just misinformed. This is pretty common. My own doctor scoffed at me taking the 5mg oral Puritan's Pride methylB12... as a test. She claimed emphathically that B12 is not absorbed from supplements. Well I proved HER wrong. She was very sheepish with my test results of 1999 after 3 months.