They may be right, but their reactions may not be helpful to you in the moment. A professional healthcare chaplain or another trusted counselor can be a useful confidant in times like this: chaplains understand the position of faith from which you have begun, and are prepared to bear witness to your anger. They will not try to dissuade you from feeling your feelings, but they will accompany you through them.
While some find the experience of spiritual distress disorienting, and cause to doubt that there is any goodness in the world, you may find yourself experiencing the exact opposite things.
Amazingly, even if you never described yourself as particularly religious -- even if you never once considered the presence or absence or temperament of God -- you may find yourself thinking thoughts about God pretty frequently these days.
Perhaps this experience is, for you, definitive proof of the nonexistence of God. Perhaps it is just as definitive proof of God’s existence and benevolence. Perhaps, however, this experience raises more questions than answers. Perhaps you’re furious at God and wondering if you are even allowed to be furious at God.
If you are a member of a particular faith community, you may find a conversation with your religious leader to be helpful during this time. He or she can help you understand exactly what your tradition teaches about how one should deal with anger towards God.