Bruised and Sore hamstrings

I was fine sunday and then monday yesterday and today I have had VERY sore hamsrings( back of my thighs)  It feels like I have worked out for hours.  I work out almost daily but have not in the past 2 weeks or so.  There have been other times I have taken time off from the Gym and didnt experiance pain like this so I dont think it is related.  Also it is in both legs and I have bruises on both of them.  I have no idea what is making them feel like this.  2 days ago I was in the shower and sort of zonned out for a minute....I sorta forgot where I was and what I was doing for a second.  I have had one or two mild chest cramps.   Any ideas of that this could be?