Might Have MS - is it hereditary ?

My doctor said I might have MS. He didn't seem too worried about it and he said that he'd see me in six weeks. He also told me that there are no difinitive tests to absolutely tell if someone has it. Here's a little history about my health. I'm a 44 year old female. I have a history of Hep. C from a blood transfusion in the early 80's. I have no viral load, just antibodies. I also have degenerative disc disease and had a fall at work that herniated 2 discs. I have had two back surgeries that left me in more pain than I was in before. I have also been diagnosed with chronic fatigue syndrome and insomnia fibromyalgia, osteophytes from c3 to c6 that infringe in the nerves in my hands. I am in constant pain with terrible muscle spasms and cramps. Recently I have been falling alot. Most recently down a whole flight of stairs. My right leg goes numb, I fall. My right hand goes numb, I drop things. I have absolutely no interest in sex. I have really bad pain behind my one eye. My vision has gone to crap overnight. I have really bad restless leg syndrome, (my husband hates it). I have a history of MS in my family. My grandfather and two cousins have it. Is it heriditary? Is it possible that I might have the beginning of symptoms? Is there really no tests out there that can rule it out? I'm really frightened and depressed. Can anyone answer any of my questions?