I've started to feel really run down, and I felt just like this over the summer. The main trouble is that I get a feeling of terrible motion sickness, and even when I'm sat still I can get dizzy and feel really sick. I had my eyes tested about six weeks ago on the advice of my doctor, but my eyesight is perfect, and now I'm fed up of it. Should I start taking some kind of supplement to boost my general health, or could it be a specific problem thye haven't picked up yet? I'm really fed up of never feeling entirely well