Even if you carry him he will still learn to walk, same as even if you play with him he will still learn to amuse himself sometimes too. He could just be wanting 'homebase' (or the mother ship as we call it) now you are home and back into your normal routine. Plus the more independent he becomes the more he might just need some gold solid 100% mum time to solidify it. Sounds odd but the closer you two are, the more confident and independent little ones will be.
Glad to hear you had a good trip. =)