I am very sorry. And life has alot of events that mold you in the future..they are hard to get through but,you are strong and can do it.
It is time to see a doctor my friend. If this depression is hitting you that hard.
Talk to the HR Dept at work, and let them know what is going on with you. Hopefully if you agree to get treatment they will be willing to work with you. But you have got to follow through.
It is time to start healing,and moving on...and you are not able to do that by yourself.
Breaking up with someone is very hard I know that..but it is something that you go through more than once in life before you find the right person for you.
Here is some info I found on the net...please read it,and please please make that appointment today.www.mayoclinic.com/health/depression/DS00175/DSECTION=2
Keep us posted and stay strong.