I will come to your house and hold him for you csws.
Really.
Just let me know if you want me to...
Do homestart operate by you? Someone to cuddle ds while you have a bath/nap/tidy up is exactly the kind of thing they do.
I've no idea if a hammock would work....my brother had one and my nephew loved it, but their new baby doesn't.
Likewise the musical thing.
I just got used to it with dd2 I think
DS is still a nightmare skleeping now....I've just put him into bed after he fell asleep in my arms downstairs.
4 hours of variations on bed and cot and jumping on dd2 have failed.
He's ill still right now, but I've no confidence that things w3ill improve when he is better.