Vitamin B12 supplements.

[Ann]

After having cold, cough, sinus infection, gastroenteritis bug, now chesty cough almost continuously since the beginning of December I have been feeling very run down. I rang the pharmacist to seek advice and they advised Vitamin B complex and they were quite expensive. I haven't taken any yet as the day after I bought them I had a stomach bug. Has anyone taken this supplement, will it be ok to take with blood pressure medication and do they give you more energy? I went to the doctors yesterday and she is doing lots of blood tests but I forgot to ask about these tablets. Thanks!