Hey T, This is not the first time you mentioned it doesn't work for you to bite your tongue and bottle it up. Actually bottling it up inside is not the same as "letting it go". You need to find a way to release it so you don't lash out later at your W with resentment.
Instead of bottling it up, how about coming here afet each incident instead of storing it until you can't take it anymore. That way too, you can get tips on 180's to work at without the built up stress levels.
When you speak your mind, how do you approach her? The 180 might be using a slightly different tact in the way you express yourself or just in timing or setting.
Let us help you find a different way to handle it...