... lactose intolerant. I'm wondering what I can and cannot eat. Does anyone have Celiac and LC and can make suggestions for a diet? I also have arthritis, adult congenital heart disease and COPD. It seems that my chronic diseases and their medications exacerbate my digestive disorders, i.e. Pain melds for arthritis wreak havoc with my g.i. tract. Any suggestions for medications to treat arthritis that won't make the LC worse?