It's a sound tactics imo but it might be more diplomatic if you'd start "I got the impression that you think..." rather than "I know you think...". It sounds less accusing and leaves him the option to claim you misunderstood his actions (or lack of). This way both of you can keep face.
A for the rehearsing panic bit: I am so not looking forward to a complicated dental surgery. Got the date yesterday: Feb 11th. 2 months time for trembling, having nightmares and trying to find a way to skip the appointment. (I'll get an implant in the upper jaw and since the one is too thin the dentist must lift the bone. To that end he'll crack it in one point, push it upwards and then insert the implant with the bone - hopefulle - growing around it in a bump. It'd be bad enough to a normalie but I have a dentist phobia..). So basically we are sitting in the same boat: we're both scared, we both know things can go wrong and we both know we can't chicken out but must go through with it. So, let's be strong together