Panic over....I got at least some kind of reply** on WhatsApp....'Thanks mum'.
*he's terrible at replying to anything, I have more conversations with his girlfriend, they're driving across america, Seattle to Portland (i think) & staying in hostels & extended family.
Thanks for the thoughts everyone!
** to him,.... are you both OK, where are you now, where are you going to next, ive sent messages on others apps to make sure youre ok, happy birthday......etc etc etc.....he's 30 & an adult and apparently badly brought up!