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Thanks for your question.
What symptoms do you have now?
Vitamin B12 and folate supplementation should improve your symptoms within 3-4 weeks.
All your symptoms may not be related to the B12 and folate deficiency.
Anxiety should be controlled by psychocounseling and also medications if required.
Digestive problems should be checked with endoscopy, ultrasound to rule out liver, gallbladder, pancreas problem and also stomach ulcer.