thinking this is extreme?

[EllenandBump]

My sister at certain times of the month, gets very teary over nothing, generallu nasty and horrible and sometimes on the verge of hysterical.

Is this PMT or something more serious.
Am i being unreasonable to ask for others opinions/experiences and ask if there is anything she could be put on?

So it started when she was about 14 then? If it's not restricted to the times of her cycle, then she may have a mental health problem instead - but the problem still remains that SHE has to be the one to ask for help. And if she thinks that she's ok, then she IS going to keep going until she drives everyone off and then bemoan how awful her life is because everyone is so mean to her. I feel sorry for her DP tbh - living with someone with those sort of issues is hard enough when they recognise that their behaviour can be problematic; living with someone who couldn't care less how their behaviour affects other people would be a nightmare. :(

I think he's getting to the point of either get it sorted or kicking her out. Which i dont want to see happen of course. I also worry that if he does kick her out, she'll go back home to mums and mum will be abused again, until the police get called and she'll be bailed to MY address when i get it and i cant have her there with me. Its hardly fair on my LO. she really does seem to be ill in some form, its like violent toddler tantrums and sometimes just cos she cant get everything her own way

I'm pretty sure no one can make her go to the GP now, however ill she might be - but perhaps if your BIL gives her an ultimatum re. going, it might gee her into doing something about it. Or perhaps they should go to relationship counselling so he can put his side of it in a mediated arena, so she can be told by a 3rd party that her behaviour is NOT normal NOT acceptable and needs something done about it.