You seem to be going through a tough time. I can feel your pain for not being able to find the right solution for your problem. However, a long standing case of severe depression needs time to get better. Sometimes medication needs to be altered if they are not helpful. You could talk to your doctor about it and seek his support or look for another doctor. You need to have hope and faith that one day you will be able to recover to a certain extent and lead a healthy lifestyle.
Next Steps
A counselling psychologist can help you to feel less suicidal, develop healthy ways to cope with anxiety, hopelessness, worthlessness and helplessness and work on developing your confidence and self esteem. Please have a daily routine which you can follow easily.
Health Tips
Try to look at the positive side of your life eg. What is still working well in your favour, what can you be thankful about.