Im so sorry for your struggle. I understand how hard it is to have severe depression. For over 14 plus years I had and still do to a lessor degree depression. I was hospitilized before and tried many meds during that period along with different therapies. Though right now it may feel things cant feel better they can. You have to try to hold to hope even if it is in something small to get you by. Try to just take minute by minute even to get through the ruff periods.
Sometimes it takes a combo of meds,self help,etc to get to a better place. I do believe support is so important and like you when I struggled I had very little. Could you join a support group? What about a hobby group to meet people?
Just know you are not alone. Stay strong