1/ Sore tongue is usually a sign of b vitamin deficiency. Vitamin B2 comes to mind
2/ Magnesium loss is likely. Diabetes, blood pressure, adrenal issues, weakened immunity, weakened detox are associated with low magnesium. High Absorption Magnesium from Doctors Best has given very good results.
3/ Iron. I would not be taking iron with an infection - iron helps biofilms form and you have an infection in a biofilm environment then they are almost impossible to completely eradicate.
The use of lactoferrin reduces biofilms, it was the most effective biofilm protocol that I used (and I used a wide variety of items). Be careful with it if you do it since it is very effective and can overburden the detox systems.
Coated tongue is a sign of infection. Go the Eagle Herbs and they have a free tongue diagnosis chart. Your acupuncture person should know this.
Infections put a lot of stress on the body (endocrine, detox etc). Antioxidants can be of a great help.
The information presented should be considered educational only.