Hi Momma - hope things are looking up for you.
I really don't handle stress too well. I get so worked up, then anxious and feel like i'm letting people down. This in turn can sping me into depression. I feel like a tightly coiled spring and just want to get away from it all. This withdrawing is probably not good if you are trying to avoid depression. Guess this isn't helping you much, but i hope you realise you're not alone.
You need to look at each situation and decide if it impacts you. Then you need to decide if you can change anything - only then allow yourself to get involved. You only have so much energy and emotions - don't give away more than you can afford to, and NEVER put your own health at risk through helping someone else; especially if you teatering so close to the edge.