Ulcer problem. Of vit b12 n vit d3?

I have feel heaviness in my right side lower abdomen not pain only feel heaviness..did colonoscopy n endoscopy report r having multiple ulcer in large intestine n GERD problem in endoscopy usg abdomen n blood test r normal . Recently I m suffering from deficiency of vit b12 n vit d3. So my question 1 is due to deficiency of vit b12 n vit d3?? 2 I have thigh joint pain is due to vit deficiency?? 3 stomach heaviness is due to ulcer in intestines?? Plz tell me best medicine for intestine ulcer n do n don't abt ulcer diet?? I am so stressed due to ulcer? 4 I feel weakness, sudden body loose feeling like fatigue,hand shivering/ tingling,upper back pain,little heart palpitations not to much...is due to deficiency of vit b12 n vit d3?? Plz give me proper suggestions m so depressed due to my health issue till now I consult neurologist 4 orthopaedic doctor 1 c gastrologist doctor ardiology doctor n invest almost 50000 rs bt. No relief..plz help sir