In my 40s feeling no hope

Hi, I found this forum during my extensive search for help for people with MI in my situation. I am in my 40's with BPD, PTSD, ADHD and MD. I had a well paying job in the Public service then took a redundancy and started my own business. Crashed and burned last year and although I have excellent Drs and visit a support group, I do not have the support that I need from my family or friends...just you'll be right, it'll be ok etc. My diagnosis was made over 20 years ago and I managed to keep it/them secret from my workplace for 7 years due to fear of stigma. I have two grown kids who have left home and it's just me and my pets.They have only just realised how dire my situation is but don't know how to help. My Drs agree that my medication is no longer working. I have gone from being highly motivated with a generous savings account, pretty social and big ideas to facing bankruptcy and homelessness with absolutely no motivation for life at all anymore. I have been both physically and mentally unwell for 9 months now without anyone helping so I'm pretty well just withering away and very soon will have nowhere to live. I have applied for govt help and they have proved to be extremely difficult and I don't have much energy at all to keep chasing help. This is where I saw myself at the end of my life perhaps in my 70s so i feel like it's all over already. Has anybody here hit their lowest point in their 40s and managed to positively pull through?? As I said I feel as though I am at the end of my road.