Dear M.,
How sad! I'm so sorry for the loss of these relationships!
Try your county dept. of Job and Family Services (or whatever they call it these days) for the counseling, perhaps you can get some for free or sliding-scale rates since you have no insurance. Or maybe something lke CAtholic Charities?
You didn't mention if you attend a church/temple; often clergy will counsel members of their church ( as part of their job).
Could you contact the mom of the 5-year-old? maybe say you would still like to be friends with the child? I know that might seem a little weird to her, but you never know, maybe she would be understanding.
Could you send Christmas cards to the teens, and make sure they know your contact info? That, to me, is not heavy-duty contacting, it's just keeping in touch.......
Do you know anyone in the area where the whole crew is living, that you could ask to help keep you posted on how the kids are doing?
Other than that, just lots of prayers--for them and for ourself too.
Good luck!
K. Z.