I Have Chronic Bloating, Both Upper And Lower Abdomen. Plus

I have chronic bloating, both upper and lower abdomen. Plus a chronic low grade fever particularly at night but also lasting for a couple of days. I have stopped consuming dairy products and white bread. I don´t consume fruits and vegetables which are known for producing gas. I feel a little tired sometimes but nothing severe. I occasionally get a feeling of nausea sometimes requiring lying down for a minute or two. No vomitting, just the feeling. What could be wrong with me.