I have learned this to be true in my life. Letting go of our burdens (whether physical or mental) is a necessity to move forward in life and be happy and present. To feel that weight lifted off our shoulders when we are able to do so is both FREEING and EMPOWERING.
Letting go is NOT giving up, it is realizing that there are more important things to worry about it in life than the things that we can't control or change in our life.
I am also learning better to take my heavy burdens to the Lord better. That is the reason He is there for us, to take our burdens and make them light. We simply just have to let Him.