I'm 39 For More Then The Last 10 Yrs I

I'm 39 for more then the last 10 yrs I have been low energy get sick very often and just can't seem to ever feel good at work. I get dehydrated easily and it takes days to get over. I have erratic apatite and always feel like I'm missing something in my diet. Some days I feel like I can't get enough sugar.