Hi Gingerlyred,
poor you! Sounds frustrating.
My daughter always gets super giggly before sleep, and I can totally relate to that feeling when you are frustrated and exhausted yourself, and then they start laughing at you!!
It helped me when I learnt that laughter really helps to relax children before sleep, so when my daughter gets giggly before bedtime, I no longer revert into my serious mum act of 'it's time to sleep now'
I actually encourage the laughter, and everytime she laughs, I think to myself, this is actually HELPING her sleep!! It has really become a lovely bonding experience for us, and sometimes she even falls asleep with a smile on her face.
It could be that he just needs to relax a bit more than normal before sleep, and is screaming because of frustration. A laughing game of appearing and disapearing behind the door might help a lot and be fun for you both!!
I think most of the parenting advice we get is to help wind children down before sleep, but actually winding them up, is an even better way to help them relax and sleep.
But obviously if you think the screaming is a health issue, it might be wise to investigate that too.
Hope things calm down soon!