About two months after I got diagnosed with mono, all of my symptoms were gone, I didn't even have fatigue, and I was exercising again. I decided to go out and drink, but ever since then I've had occasional pain in the lower right abdomen and a more persistent pain in my right shoulder blade. It's been hurting for a little over a week and no other symptoms of mono have come back. Should I be concerned? I am only 18 and have not been a heavy drinker throughout my life.