Nightmare Mr Fibble!!
I'd empty washing machine. Run a 90 degree empty load with bleach, washing powder, fab conditioner to try and tackle the washing nmachine smell.
WRT your smelly washing, I'd try a normal wash but double up the amount of washing powder and fab conditioner. It may be worth getting some super strong smelling fab cond like Lenor if you ususally use an eco one.
I am mother to Earthymama's DGS. I too have gone rapidly grey and I think I have mentally blocked out the more 'difficult' times I had with him as a toddler.
Tho still shudder when I remember him climbing out of his cot, silently opening FOUR stair gates as he progressed through the house, climbing out of the dog flap, negotiating steep steps down to a bolted gate where we had a full 10ft paddling pool set up on the decking. I woke up, searched the house, no DS! Finally found him, naked but for his nappy, trying to climb into said pool!!
PS, he is FAB now and excellent at finding anything we've lost, 1st with his shoes on, will get everyones, hats, scarves, coats, gloves without being asked and 'organise' them into getting ready, including his 13yr old big brother
Good luck with the stink!!