Hello and welcome to the forum. Mass on the liver can be due to numerous causes like haemangioma, hepatocellular cancer, metastatic cancer, liver cell adenoma, pyogenic abscess, amoebic abscess, cyst, focal nodular hyperplasia, hydatid disease, sarcoidosis, tuberculosis etc.The symptoms can be related to many of these conditions mentioned above. Liver haemangioma is also a common condition which is usually discovered during a test or procedure for other condition. But it is usually asymptomatic. Tiredness, nausea and pain can be due to kidney stones also. You need a detailed work up to evaluate the cause of this liver mass and treatment will depend entirely on the cause. Consult an experienced surgeon. Hope it helps. Take care and good luck.