What Causes Irregular Bowel Movement With Twitching Of Shoulder?

Hi. I have this problem which I believe to be some liver disease. Started circa 2,5 years ago with some kind of muscle weakness in my hand fingers. well I don't know how to explain - muscle weakness, irregular movements. basically when I try to move it's not like one smooth movement but movement consisting of many small movements, like twitching or something. Unfortunately I didn't pay any attention to it, considered that as part of growing, I was 13 years of age then, now I'm 16. So it progressed and I started to feel the same twitchy sense in my shoulders, then at my back, and as time went by also in legs and in every muscle I feel moving. And it's been going step by step with some weird fat gaining, although I've made no changes in my eating habits and I'm sure it's the same problem that affects my muscles. 1,5 years ago as these muscle problems grew bigger I started noticing a gynecomastia which also has only progressed ever since it started. Over the past half year I've had also some hair fall, which had never happened before.