It does gradually get better.
As for the venomous thoughts? Guilty. I cracked about 3 months after my husband's death. His kids have gone NC. I quite understand why. In many ways, it's possibly better for me - I was never going to be anything other than an afterthought.
I look back and it seems to me (possibly unfairly) that their dad became an encumbrance to them after he became ill. NB They did none of the caring. I did twice ask the son to help me advocate for his dad during two separate hospital stays. DH had one visit from his son when he had his stroke.
The kids do live at the other end of the country, but the daughter could have visited him at least once. They always timed their visits back home (where they'd stay with their mother and whichever partner she was with) for when DH was no longer in hospital.
I can't give you any advice, @idontknowwhattodoOR , but I can try to tell you how it feels/felt for me.
I cared for both my parents, though they lived in their own home. After Mum died, I was all she had. We eventually managed to move her in here. For a long time, I was working full time, caring/advocating for my parents and husband...
I reluctantly quit my job at 58 - that's where all my social life was. When you're a carer, the world often becomes a smaller place.
Dad died 14 yrs ago; Mum 10. At some point after DH died I realised that part of the emptiness was no longer having a purpose in life or a reason to get up in the mornings.
I tried doing some supply teaching, but it's very different from being in a permanent school and there were no part-time jobs available in my specialism the past year. I was offered a full-time job, but I'm not up to it now. (65 yrs old now and dealing with 5 classes of teenagers a day gets to be a bit much.)
I'm trying to get out in the world again. Daft though it might sound, for me the local gym has become my safe space. Haven't been able to go today - I have a dental appointment.
When I do go, I have a workout and then go to the cafe for a meal. It overlooks the swimming pool, so I sit there with my meal, tend to scroll through my phone, sometimes speak to people.
I've joined a couple of classes there and I'm now getting better at chatting to people. My fitness level has improved and it's definitely helped my state of mind.