What Causes Enlarged Abdomen And Lump Below Rib Cage In A Drug User?

I have been a heavy drug user since ago 16. I began using heroin and other drugs intravenously around age 20. At age 23, I learned that I had contracted Hepatitis C. I cleaned up for three years. During this time, I noticed a small lump at the bottom of my right rib cage that kind of could be pushed in with one s finger, and it would pop back into it s static position. I relapsed and stayed on maintenance opiates for another 2 years before getting totally strung out again at age 29. I had a horrible cold turkey withdrawal. I had an enlarged right abdomen, it was very sore, and I vomited and diarrhea d straight bile (a totally yellow liquid) for 3 days. It was hard on my body. After about 5 weeks of withdrawal, I was back to normal I had 10 months of sobriety and I relapsed again. I have now been using daily for 4 months. I intend on truly stopping for good this time but I am worried about my liver s status. I also want to know what that lump is thst I described. It has been hurting lately, especially when I drink or when I begin to withdrawal from lack of opiate use. What could be causing this abdominal discomfort and lump? Also, my urine is highly yellow. Not dark, just strongly colored. Thanks!