I've lost my manual too Kew...a few weeks ago DS2 (while we were on holiday, so I wasn';t at work during the day) burts out crying and said: "I miss you mummy when you are at work, I miss you all the time!" :(:(
I've also had: "Are you going to die soon mummy?"
I think you will be very good at reassuring DS as your love for him is very clear but to you both. I constantly marvel at how happy he looks in all your FB pix and how his life has turned out
Back to the more mumdane subject of lice SFX, I think Hedrin just isn't quite "thick" enough. I'm convinced that some of the beasties escape the wet combing when we use Hedrin, whereas when we use Pantene conditioner, I seem to always capture a satisfying bunch of lice 
TBH though life is a constant round of de-lousing once they are at school - we have been de-lousing the entire family each week for months but they keep catching them again 