I have a shoulder injury. My Dr gave me Nabumetone for the muscle pain and the Butalbital/aspirin/caffeine for the tension headaches I was getting due to muscle spasms in my neck. I found out that there's a moderate interaction warning with taking them together. Should I still continue to take them? Now I'm worried. I take the Nabumetone most days and the Butalbital/aspirin/caffeine only when I need it.