I'll say "yes" for you re the developmental stage The first couple of years are full of them, and they really are soaking up so much information to learn and process, I would feel a bit overwhelmed myself I think! and require a few extra cuddles.
We had this when he was a bit younger, and it turned out to be his teeth - but he was screaming like he was scared and would bury himself into me, and the slightest movement of trying to put him down would start it all up again, so I didn't cotton on that it was his teeth until they were cut through! It was another thing that passed.
Re the separation anxiety, apparently it can reach a peak between 12 and 18 months, so it could well be that. Is moving the cot into your room an option?
Edit: thought I'd just add that that was the time we started co-sleeping since he hated the cot so much at night, and he hasn't done it since. Perhaps it was separation anxiety too? *shrug*
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