I can understand the feeling of loneliness and as though no one cares. Many of us struggle with those emotions a lot.
You may want to try elaborating on your second paragraph. Have you been close friends for a long time and just recently she's backing off? Perhaps she's in a romance now (taking up some time & energy)? Or, maybe she's never into text messages. Would she rather talk on the phone? You can give her a call and talk with her. IMO, it's better: your words can be explained instantly, if she doesn't understand or if she's taking them the wrong way. Can't do that too easily through texts, in my old-fashioned opinion

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Just some ideas for you. Something to think about. When you post in Psych Central, try to post in a couple of applicable forums - like relationships, depression, general. Better chance of getting a quick response. Another tip: Be a little more descriptive. It's hard to see that this thing between you & your friend has made you really hurt. As soon as you make a statement blaguely describing your emotions, your very next "admits" to over-reacting. Those are counter-productive.
Please don't take this post as insults, just trying to help you look at your post differently. Hopefully, you will get more responses to your posts with my recommendation/s. Very best wishes to you!
Shez