I have been feeling very run down over the last 4 weeks, so tired, headaches, dizziness, muscles twitching randomly, whole body feeling generally rubbish. initially the dr thought it was a chest infection and prescribed co-amoxiciclave. After a week still not any better so nurse took bloods. Everything came back fine other than low vitamin D level but not so low as to be considered deficient. They have given me a prescription anyway but I am just worried that there is more going on, can low vitamin D really cause you to feel so ill. Just looking for others experiences. I'm particularly worried about how tired and dizzy I have been feeling.