Wow!, I thank you all for your feedback. I mean, it has really helped me to get some sleep...seriously. Several days now past the incident, I don't feel total self-recrimination (like I did initially) for calling my sister and revealing my feelings of hurt. I'm pretty sure, though, that she feels I'm in the wrong. I do feel bad that I was angry and hurt when I called her, rather than speaking objectively and without emotion, but "it is what it is" now, and no going back.
A bit off-topic, my mother was truly "obsessed" with what others thought of her, and always displayed a high degree of shame about revealing any flaw. Seriously, I often got beaten severely for the slightest infraction of "what will the neighbors think" even up into my college years when I vistited home. So, that, along with the conditioning to compromise my feelings from early childhood onward regarding any injustice, makes it hard, even to this day, to feel justified in expressing any feelings of hurt.

I sound like a basket case here, don't I! But I've created a meaningful life, raised a daughter, and have a good job, as well as being a practicing artist. The mistake I've made is to isolate myself too much, being too alone, and expecting fulfillment from the infrequent contacts with "family."
The holidays are difficult. In the future, I hope to find other outlets for this.
Thanks to you all! PC really means a lot to me!
Patty