Don’t lose your heart Mate.
Although a detailed medical and psychiatric evaluation is needed in your case and others too but still based on your symptoms, at least we can discuss it.
Details of the “mood swings “ to be discussed.
Failures happen in every one’s life but one should try to cope up with the effects that failures cause on the persons.
You have not mentioned how educated you are and what competition you are trying for.
What ever the examination you are going, presently, you are in low mood and having suicidal ideas. You need to contact the mental health professional as early as possible.
Next Steps
Don’t act on the impulse to harm yourself.
Stay close to your family members and friends.
Communicate your thoughts with your near dears and friends too.
You are likely to be better in your thoughts and mood within a week or two, So get the help of a mental health professional.
Medication and psychological interventions are likely to improve you, so don’t get disheartened.
Health Tips
Don’t act on the impulse to harm yourself.
Go for exercise, meditation and yoga
Get enough sleep and healthy food
Contact the psychiatrist health professional to get through the low mood of the present day.