Bed time tantrums!!

My little guy turned one on the 28th of may and has been giving me the WORST time at bedtime the last week or so!! He's been great at going down without a fuss up until now and now BAM.. screaming, crying and just overall not having it! Anyone else having the same issue?? I've been trying to let him cry it out but it's driving me insane, I feel like just sitting at his door and crying myself! HELP! 😢😭