Diet And Reflux

In type A, I do not think I had acid reflux. But I do. If you know what blood type diet, he claims the A's have little or no acid. But it recommended certain foods give me problems, esp. Coffee. Now my father has the same problem, and similar foods. But he is blood type O. Should I check my blood type (I was pretty sure, however.)? Should I change how much of an AI is that when, as if I really need a combo of all, and I? I'm confused, but I have enough health issues, I have been wanting to try this diet. And I have digestive problems (once as a "leaky gut").