VitaminD & B12 defeciency. Suppliers?

Hello I've both vitamin B12 and extreme Vitamin D defeciency.. I'm taking nerobin forte vitamin B12 injections on my buttocs  once a week.. and vitamin D3 liquid once a 60,000 week.. I had problems like being fatigue, weakness, muscle pain, sleepyhead, dizzyness, numb extreme hands and legs.. it's already third week am on vitamin supplements but there is no great improvements.. I have muscle cramps in stomach and feels uncomfortable, sleepy and tired all the time.. any suggestions to overcome these problems.. I have had really bad time since couple of weeks.. bad head ache, body pain, neck pain, lower back pain and dizzyness accompanied​ by strange feeling of being tiered always.. need help, I don't know what is happening in my body .. how can I get back to normal life again.. :-( my physician said I might have absorption issues & gave supplements.. which I feel are not working.. is there anything else I need to do along with suppliers? I'm standing in sun for 20 mins morning & evening