Earlier my brother was fun going person and have good relation ship with family members,neighbors and every one praise him bu he starts behaving strangely.always angry on small things,did not give respect to any family members,even talk in bad manner with father and mother and even me.lots of bad habits like drinking and drinks lots of water,at home wanders without t shirt...mostly stay away from home and come late...may be he starts taking some drug..always says i am better and when his fault is coming in front of any person he leave discussion...what problem in he is??