Hey Anna, have you been officially diagnosed with this disorder? If not do please go see your doctor or mental health professional.
If you have been diagnosed, and are on medication, maybe you need to get a review and some bloods done, just to make sure nothing is out of whack?
Did anything stressful happen to you? Stressors can trigger MDD.
I feel for you. MDD is a horrid thing to live with. But always remember, there are people on here you can talk to, if that is what you want, or try to always keep in touch with a friend or family member, who can become your 'buddy' for when you are in a crisis.
Just restf for a couple of days if possible, & don't do anything stressful. If you feel worse later PLEASE call someone, or call a free crisis hotline.
My prayer for you:
Our loving heavenly Father, please help Anna and all the other poor, suffering souls with their depression, help her to be able to confide in someone and to cope better with her depression. Amen.
Let us know how you get on won't you.