Coffee is a drink that has advantages and disadvantages. On the one hand, it includes antioxidant polyphenols, which help to decrease inflammation and free radical damage to your cells.
On the other hand, it contains caffeine, is rather acidic, and is often doctored with copious amounts of sugar and cream.
Experiment with coffee to discover whether it improves or worsens your condition. It might be extremely useful in moderation. However, if consumed in excess, particularly with sugar and cream, the antioxidant advantages of coffee may be negated.