I'm so anxious waiting to hear a call of my dad passing

He's in hospice, and has been in one week as of today. But he's dehydrated for sure, barely taking a few sips of water a day. Although he's been having two Jellos a day which is nice. It's very small for a normal person but I read peoples digestion in hospice shuts down. So they barely eat day to day, if not nothing.
But even though he had Jello today and talked for a few minutes before being so weak again and napping, I know he could pass any day. I'm trying to prepare my mind to not be panicked if the nursing home calls. But it's so hard. I have anxiety disorder and PTSD so I'm fearing how I'm going to feel or be. I'm not on meds, I can usually eventually calm myself in tense events, after a while. But no one this close to me has passed before. I'm just so on edge and helpless he could not have had treatment. 🙁 (Cancer too rapid)