How to maintain well-being amidst multiple life stressors?
Sorry to hear about your situation. As they say, when it rains it pours and you have been flooded.
Meditation (Dr Ainslie Meares method) is one of my favorite methods for reducing tension, anxiety, and fear. It is very effective. However, there are many different factors that can support his type of meditation as it were. I often mention his books, like Ainslie Meares on Meditation, as a cheap way to start learning it but, in your situation a book would be yet another cost to your budget. So, some thoughts on some other supports that might help.
There are some charities and similar organizations that provide free, reliable financial and legal advice. A good source might be able to help. For example, they might be able to suggest which costs are likely. Or, to suggest strategies to minimise the losses. Not perfect but better than things may seem at present.
In relation to the knee injury, in some countries\states if work contributes or aggravates a pre-existing injury then this counts from a legal compensation perspective. You should at least find out what the situation is in your jurisdiction. Good free legal advice should explain the facts, your options and the downsides as well as upsides of each of them.
A torn knee cartilage needs to be treated carefully and you should not attempt anything that might make the knee worse. The Egoscue method has various gentle exercises that does help with things like knee pain. for example, my own left knee and those of others helped make this clear. One practices these gentle exercises provided they do not increase pain. Increasing pain might mean further damage is occurring. You should also show the exercises to your doctor, before you try them out.
The third exercise involves laying down on the ground and you would need to figure out how to get down to the ground and back up again without causing pain in the knee. A chair,box AND a human partner might all be needed to do this safely. That being said, if any of these exercises caused pain in the injured area you will need to cease them immediately as your injury is being made worse.
Good luck with things.