Moonlightshadow

Hi, tonight my 07 Galaxy had the battery light come on. 5 minutes later the radio went off and Power Steering Malfunction light popped up seconds after the steering went very stiff and I almost crashed. The abs warning light came on. I limped it the mile or so home and now it's dead and won't turn over. A few minutes earlier I was doing 60mph on an unlit bypass in which case I would be in a waterlogged ditch around about now with my 1 year old baby. To say its scared the life out of me is an understatement. Any ideas what the problem is I'm presuming it is to do with my alternator or aux belt but wondered if it is a common problem. It has just had a service and mot a week ago and has done about 75k I replaced the battery less than 12 months ago. Thank you in advance for any replies.