Help widowed mother of 2 stay afloat

I really hate to be doing this and it's really difficult for me to swallow my pride and denial but here we are. As most everybody who will see this knows, my children lost their father very suddenly in September. Somebody suggested setting up a fund when it happened but at the time it was just an upsetting concept because I knew money wouldn't bring him back and that's all I wanted so I declined. I was told there were programs and that help would he given but I've been left almost completely on my own. We weren't legally married so the state doesn't consider me a widow, he was working to support us under the table so I have no proof that he was, I havent even been able to obtain a death certificate to try and apply for social security benefits because I'm too emotional to do it on my own and have no help. We dont qualify for any sort of programs or assistance and I'm still struggling immensely with PTSD and limited childcare so I havent worked. I was getting by a little selling things on a few platforms but as most know, between holidays and tax season nobody wants to buy anything. As much as I wish I could muscle through my mental illness and find at least a very part time job, I am now facing a dental crisis that will require surgery and leave me without teeth to even chew food for 6-8 weeks. I've been neglecting my health for years between working and taking care of my kids to the point I'm genuinely afraid this will kill me if I dont stop to take care of it. I will fortunately be able to file taxes earlier this year and once I get my return I will be able to maintain some stability but in the meantime i am admittedly struggling and anything helps