Should I sue my employer for discrimination?

I am an Executive Administrator who has been at the same company for 11 years. I have been in my current position for almost two years. I've spoken to HR several times regarding my managers behavior. The glaring offenses are:
*All direct reports, except me, asked to complete a development survey for manager.
*All direct reports, except me, asked to travel to attend a team meeting.
*Though promised the ability to keep my flex schedule, I am required to come to the office everyday. No other direct is required to do so.
*I am not allowed to provide notarization services during work unless it's for my manager and I don't get paid for these services.
*Rarely speaks to me directly. - Is this your question? Add additional information