Not all "happy, happy" this time!

Right off, this is NOT a happy post! This is an "I need a place to vent" post! My coping place...if you don't like it...really sorry, but just skip this one then! I just have to ask...what is up with sibling fights? Does anyone else have to deal with this? My boys fight ALL OF THE TIME...Seriously, ALL OF THE TIME! I don't know what to do about it. It makes me feel like a horrible mother. I can't get them to stop and the more I try the harder they seem to fight! Today has been the worst yet! They are getting sick of each other this summer and it is escalating into fights every other hour. I don't remember fighting like this with my sister at all...I mean, don't get me wrong, I remember fighting with her... just not all of the time. So, what do I do? Do I butt in? Do I stay out? Do I take them to counseling? Seriously, I can't hardly stand it anymore! They are constantly saying they "hate" each other...which breaks my heart! Brothers aren't supposed to "hate" each other...are they?
Okay, see, now I feel a little better! Just getting that off of my chest! See, it isn't "happy happy" ALL of the time around here! Just in case you were thinking that! :)