I have had mctd for about 10 years. It is a complicated syndrome that presents and develops differently in every patient. The classic definition is to have symptoms of lupus, polymyositis and scleroderma. In reality, you can have symptoms of any of those or even other AI diseases. Mctd does not morph into lupus it is a diagnosis on its' own that can include lupus. I presented with lupus symptoms and then polymyositis but never had and definitive scleroderma symptoms.
First line treatment is steroids and often Imuran or methotrexate depending on your particular symptoms. Some cases are mild and very treatable, others, like mine, are severe and difficult to treat. My docs did bring mine under control and life has been good the past 9 years.
Nobody can tell you exactly how your case will develop. Just don't ignore new symptoms particularly muscle weakness and fatigue. Of course, lupus symptoms can include organ involvement so make sure you are getting labs periodically.
MCTD (SLE Lupus, polymyositis, scleroderma). Diagnosed 2005. Kidney, liver, GI tract, dysphagia, raynauds, barretts esophagus, quadriplegic in 2005. Recovered and now active in downhill skiing, golf, hiking. Meds: amlodipine, benezapril, omeprazole, potassium, folic acid, vitamins, maxide.
Remain Optimistic and you can overcome.