I feel extremely tired, wake up tired etc. i am drinking vit b but it does not seem to help. no energy or morivation for work, have to struggle through each day. my iron was very low a few months ago, not sure if that is the problem.

Doctor can evaluate: Normal, healthy people do not have "constant tiredness," without a good reason. One's primary care doctor can follow along and look for one or more reasons for fatigue, such as anemia, infection, mental illness, auto-immune disease, thyroid problems, cancer, insomnia, etc... Various tests may be needed, depending on one's whole story, and sequence of symptoms.