How to stop my mouth?

Any advice out there? I was in management and when I had my 4th pregnancy loss I stepped down due to stress, depression, lack of motivation, with no help or support at work. After 2 years I finally found a place I was happy and started to enjoy my job again. Now after being approached I'm stepping back up. The question is there are time I can't stop from saying how I feel about how I was treated? I'm not one to no voice my opinion.