My wife and I had to abort out 3mo unborn child due to complications. Now my wife is very upset with me and I don't know what to do. How do I console her?

As you have to take the decision because of complications, your wife should not be getting upset with you. Losing a baby causes a big lacuna in a woman's life not only physically but psychologically too. A little life was growing inside her and she must have weaved plans of the kid coming into her life and now when it didn't happen, she must be depressed. I think you should give her sometime to accept things. She must not be angry with you but with the whole situation. Since, you are the husband, and the only person who was so closely related to the pain she is going through, you are the only one she can take out her anger and frustration on. Deep within she knows you took the decision because you love her and want her to be in your life. Please be by her side and give her immense love and care so that she moves and forgets everything and looks forward to a new start.