I too try to avoid phone conversations, especially with my partner who frustratedly LOVES communicating on the phone. Also diagnosed with ADHD..he’ll call me several times to say basically the same thing and add one or more new details. Repeated information drives me nuts, especially if it’s something I’m already sensitive about. I often start having a anxiety attack trying to focus on what he’s saying. It’s like I can hear the words that are being are being said but I can’t process WHAT is being said fast enough. I think it’s because I can’t see his face or body language. Especially as I mentioned if it’s a subject I’m already feeling anxious about.