THe most important thing in caring is to look after yourself first, you have to have some sort of shield from your emotions. It's easy to say and a lot harder to do!
You don't mention the age of who you care for, have you had any help in knowing what aspects you should 'care' what aspects you should 'support' and what aspects you should 'monitor'? They are very different for each person, and that to is something to remember that they are a 'person'. We all need to learn the tools to which we have to live life through, some this learning comes easily some it does not, hence the differences between care, support and monitor.
We all go through stages in life where we need to be cared first and foremost, when we have learnt we then can be supported and then monitored, does it not sound just like how we bring children up from babies to adolescant and adult?
I have over simpilified it I know, but sometimes just looking at the basics and knowing when you can break off for them to 'fend' for themselves is very much as skill as well.
Speaking now from the heart, my 'mental health' problems came on later in life and my wife had (still has sometimes) the same problems in learning the differences between care, support and monitor, I also had problems in accepting each one of them, the end result whilst not curing me has given me further 'tools' in life to be able watch out for and help myself more and more.
I am sure people on this site will know of times when my posts have verged on the ridiculous (some may say past that) but again through the differences of care, support and monitoring I have learnt and learning to move forward.
So sorry its such a long post, I hope I have made some semblance of sense.
Can I also say thank you for the care, support and monitoring you are doing and remember if you fall then no one may be able to continue like yourself that is why it is so important for you to look after yourself first, if it knocks back the person being cared for a little but you then are more resillient then that is a price worth paying!!
Best Wishes
Michael