I am a 26 year old female with previously good health. Over the last three weeks I have been experiencing severe pain in my left shoulder and left side of my neck.. If I attempt to use my left arm it feels like the muscles are going to tear. I can not fully turn my head to the left with out severe discomfort. I have been to the doctor and the doctor said my left thyroid is fairly enlarged. However, the blood panel tests came back normal. I have no diagnosis but the symptoms persists for weeks now. I also have been feeling unusually weak/tired and having severe PMS like mood swings, and this is not normal for me. It also feels like a few lymph nodes are swollen on the right side of my neck, though these are not painful and can only be felt, not seen above the skin. Thank you,