For last 3-4 weeks, feeling too tired while trying to wake up in morning. Sleep cycle has increased to at least 8 hrs. Don't feel fresh while work and always feel tired. I have taken a blood test and my vitamin d Lev el is too low (9 Ng/ml). Prescribed is 30 Ng/ml Also, vitamin b12 level is also very low 62.9 pg/ml, prescribed is 200-900. Additionally, I have lost weight considerably and it has come down below 60 kg. Please suggest some prescription and diet advice