It sounds to me like you may have celiac disease or else you are suffering from wheat destruction of your intestines. See this report: http://tinyurl.com/Wheat-Health-Problems
Each 1,000 IU Vitamin D3 will raise your blood level by 10ng/ml. so you need to take about 4,000 more IU's of D3 Geltabs daily to reach 70 to 80 ng/ml.