Feeling down

I am feeling down for some reason. I also had the mark for this entry as tragic.  I don't know if it is tragic or not but it suited my mood for some reason.  I had it as tragic because my mood is going down and I am not feeling too well.  I am tired from my mood going down.  I don't know.  My mood will not settle? I will always be like that feeling well then all the ugly thoughts rush into my mind and I will become sad?  It is emotionally draining.  I am scared of talking about my emotions. 
My sister just talked to my grandma in a very bad way because she was upset.  I want to be able to express my emotions without being worried about what other people will feel and think about it.  How do I do that?  I feel inhibited and very afraid that I will hurt other peoples' feelings.  My sister seems to be able to express her feelings without regard to other people.
Ok here we go. I am going to try it.  I am going to express my feelings without worrying about what other people will think.  I feel very down.  My anxiety is up again I am somehow unable to talk about my emotions uninhabited. Why????? I am very anxious... it is numbing.   I will try again later with a change of mood maybe...