Is she just attention seeking or really sick?

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I am really mad with my sister at the moment because I have just had my Mum crying down the phone to me that my dear sister might have a tumour. Now don't get me wrong, I would hate for her to be ill and I am concerned but we have never had a brilliant relationship and I find communicating with her on obligatory family holidays is more than enough. Since she swanned off to the other end of the country about 4 years ago to start a new life with her rich new boyfriend after being tied down to "supposedly" looking after our disabled Mum. Everything was fine as she was living the high life and swanning off here there and everywhere. Then she got a water infection which was treated but came back. This went on for a few months and she was told it was cystitis/water infection and just kept getting antibiotics. Eventually she got fed up with the diagnosis and went to see a specialist who said she had some kind of bladder infection. Still the problem persists so she goes back and is told it might be some rare bladder disease and she would need a laparoscopy. Result - inconclusive. Doctors kept saying she had a water infection so she saw somebody else. Result: possibly something in the bladder as it is inflamed but definitely endometriosis. Cue first melt down. Ok so endometriosis is no joke and I was sincerely sorry and sympathetic but since I have kids then anything I had to say was irrelevant. The bladder condition was investigated again and again with one doctor saying definately and another saying no but she spent hours researching on the internet to find it is incurable (if she has it) so woe is her. Then she has got a bad back so she can't sleep which coupled with the bladder pain and constant colds and period pains means all she does is moan. Every time she feels crap she phones my Mum and moans about how bad her life is, how much pain she has, how little sleep blah blah. So my Mum is left to feel bad because her daughter is in such a bad way and there is nothing she can do about it. Which means I have to put on a brave face and try and make her feel better despite my own problems. So the latest revelation is that she has some kind of muscle weakness that did not stop her driving, working or going on holiday to Thailand strangely enough. Now she phones to say she might have a tumour because she saw the doctor today. But she won't know anything until she gets a scan which is who knows when and I would not doubt that if she is ok (which I hope she is) she will keep looking for a diagnosis that is going to turn out to be really rare. So my Mum has gone into meltdown and is going to worry herself senseless about it while my sister keeps her up to date with all the pains and problems and misery knowing there is nothing any of us can really do. So the problem is that I am so sick of hearing about all these health problems she is alleged to have because she just keeps heaping the misery on my Mum and I am finding it hard enough as it is to keep her on an even keel. I just feel it is incredibly selfish of my sister to keep harping on about everything when Mum is not in the best of health herself and my sister knows that she will just worry and her health will deteriorate. She just seems to think that it is my responsibility to look after Mum as I am not working - yet this is because I have a young family to care for and I need free time in the day to keep an eye on Mum and take her to doctor's appointments, shopping etc. So I am being insensitive to the suffering of my sister or am I right to be annoyed with her? How I am supposed to help my Mum deal with all this when she cannot do anything for my sister and all the tension and uncertainty is very bad for her own health? I really need an outside perspective on this and advice on how to handle this situation as I am sick of treading on eggshells.