About injection and orlssn

I got my b12 and d levels checked. b12 is 227 and d3 is 23.5 . My Gp told me it's not that bad. U will need 1500 mcg on a daily basis and injection once every month and the same for vitamin d. I have most of the symptoms mentioned here Any advice is my Gp correct or should I increase the dosage. I have been deficient for like 3 or 5 years .