1. A therapist would need to know both sides of the story. So your wife's version is also important. The issue can be resolved either way with the help of a psychologist or a marital therapist.
2. You seem to be suffering from Depression. Suicidal tendencies are not good.
Next Steps
See a Psychologist as soon as possible for both marital issues and depression. A detailed evaluation would probably be needed.
Health Tips
1.Go for brisk walk in the morning.
2. Shavasana will be helpful.