You mood is totally influenced by worry about your father, That is normal.
In the plumbing discussion, you should completely overlook the "tone" in her voice. She could just be aggravated about the pipe, or the friend's plumber, or a 1,000 things at work. Reading that tone and taking offense is part of mind-reading. Let it go. If she's mad at you, let her say it, otherwise don't assume it's about you. I've learned to overlook a lot of little things that might have made me angry before Retro. It is better to sidestep arguments than to have them. Never look for the bad, only look for the good.
Don't be surprised if it takes Retro a long time to call back. They are all volunteers, and they have their own schedules for working the work into their lives. They will call you. And also you needn't worry too much about that "open mind, willing heart" question, it goes by surprisingly easily. You're doing great. Keep those prayers going.