I feel suicidal most of the days, does anti stress medicine help to control it?

Benzodiazepines are used for stress not depression. If your depression is stress related they may help. What you probably really need is an antidepressant. There are many new antidepressants that are very effective. Some are calle SSRI's - Selective Serotonin Reuptake Inhibitors. These have proven very effective. The side effects of benzodiazepines include tiredness, sleepiness, dizziness, and you can become addicted to them. So be careful using them, make sure you follow your doctor's advice.