3 Day Vacation at Campgrounds

It's hard for me to accept.

I am so used to chatting with my best friend every day that when, for legitimate reasons, I can't - I am having a very hard time adjusting to it. I don't think she is having the same problem as I am.
I am sure that when she thinks about it, she misses chatting too, but having such a good time with her family, it's hard to believe, I am on her mind very much.
I have asked her to learn to text on her cell phone, but I don't think she wants to learn or simply doesn't want to be tied to me in any way when on vacation.
I have done my best not to text to her as I want to give her the vacation time she deserves. It's so very hard to look at my cell phone and not text something, even something as simple as saying "Hi, how are you doing?".
It's only been 3 days and they are going away for 2 weeks at the end of June and part of July, starting on the 27th of June til the 10th of July. I know I will miss talking to her very much and she said she would miss chatting with me too. I have a decision to make concerning texting, as I could send some little message every day or so, but I should ask her to see if it would be OK to do so.
Last, but not least, She will be away on the 4th of July (my birthday) and I was hoping to get at least a "Happy Birthday" from her. I haven't said anything to her lately about my health, but things are not going as well as I would want. I know I am failing pretty fast, as when I come home from work, there are some evenings - I can hardly move. The computer is a laptop on the coffee table, so I don't have to go downstairs as I used to. I get out of breath going up and down the steps anymore. I try to be very upbeat about everything when I talk to her, no matter how I feel, as I don't want to turn our chats into "Pity Party" discussions.
I have told her and Jon that I was preparing to go to Canada to visit, which I am, but the actual reality is I probably can't afford the trip anyway or worse, physically not able to go either.
I don't think I have many more birthdays to go. Even my neighbors can see it as they have taken the responsibility of mowing my lawn and shoveling the snow.
I guess I am just an Old Man trying not to lose the only TRUE friend I ever had.
I feel so lucky to have such a friend, many live their whole life and never have a friend like Rachel.