Take a diet rich in Vit B12 which should include meat and animal
products, cheese, such as beef, liver, salmon, cod,
and eggs. Take B12 supplements
and breakfast cereals fortified with vitamin B12. Finding the cause is important.
The rash could be due to Augmentin and other drugs you are taking. Once the B12 injections start acting, the medicines can be stopped after talking to your doctor. Talk to a nutrition expert about a diet rich in B12.
Hope this helps.