I recently found out that my vitamin b12 level was just 109. I'm currently getting injections for the same. I still have about 4 weeks to go for the injection course to complete. So far I've taken about 10 injections. Although my weakness is mostly gone since I started the course I still get tired very easily, even when I walk for just about 5 minutes. How do I gain my strength back and get rid of fatigue and weakness?