Dear Annie: Two and a half years ago, I made the difficult and dangerous decision to leave a 25-year abusive marriage.

My younger brother came to my rescue. He and his wife accepted me into their home to have the safety and supposed love to start my life over again at the age of 63!

Now that a couple of years have passed, a divorce and very small property settlement are completed, I've noticed a change in my sister-in-law. She tends to find issues with others and with me that are absolutely ridiculous, and anger comes out in tantrums and with road rage/aggressive driving. For example, she got into a fight at the local grocery store because someone was walking too slow to get a basket.

I feel and hear the wrath! She is bipolar, has horrible mood swings, pretends to be happy and kind in front of my brother and then is extremely mean and cold when he's not around.

I don't do confrontation! Been there and done that with my ex. When someone in this particular mindset begins this behavior, I shut down. There is nothing I could possibly say or do that would make it better. She has such conviction in her bad behavior, it's always someone else's fault.

PTSD to the max for me! Each time she behaves this way, I relive horrible moments from my past two-plus decades of abuse. I'm currently on SSA only and don't have the funds to secure my own place to live. Please help me resolve this crisis without losing my only brother. -- Sister-in-Law With Major Mood Swings

Dear Sister-in-Law With Major Mood Swings: The abrupt change in your sister-in-law's behavior is definitely concerning, and it's important that she is working with her doctor and a mental health professional to bring her bipolar disorder under control. Without making any accusations or casting blame, ask your brother if he has noticed any changes in his wife's behavior. If so, he can help her get the treatment she needs.