Good to hear. I would suspect correcting your B12 can help with your HGB and fatigue. Oral supplementation is effective. Do you know why your b12 is low?
Once it's restored, you will probably need to continue to supplement it unless you can remove the cause. Aging plays a role.
Restoring B12 can very easy and is for most. But it can get complicated depending on the person. So if you are one of the easy ones, Jarrow makes a good sublingual methyl form of b12 in the 1000mcg and 5000mcg dosages that are effective. They also have a sublingual formula with methyl-folate added to the B12. Both forms are bio-available meaning they do not need to converted by the body in order for them to be utilized.
Marlene, wife to John DX w/SAA April 2002, Stable partial remission; Treated with High Dose Cytoxan, Johns Hopkins, June 2002. Final phlebotomy 11/2016. As of January 2017, FE is 233, HGB 11.7, WBC 5.1/ANC 4.0, Plts 146K.