How do you get over depression?

My husband and I are first time home buyers, and we have yet to put an offer in on a house. Every time we get excited to go look at a house, we tell the Realtor and she goes to put the appointment in and they tell her they have an accepted off or they are going to closing this has happened 4 times already to us. and I am getting depressed I have seriously thought about suicide but the only thing holding me back from doing that is my son who is 2 years old, How can I go on and get over this depression?
5 houses now