Essie, you should have put the thing about hitting him - dare you! (suggest you name change first though!)
Amber, I know nothing about hypothyroidism but is it something you just develop? I only ask cos you obviously had no problem conceiving Luke, so is this something you've developed since? Btw, FWIW I think that charting your temperature is a waste of time and can make you very obsessive, but that's JMO and obviously it's up to you! Frequent sex around your fertile time is all we were advised (before we found out that was a waste of time of course! ).
Are you being looked after by a specialist? Has s/he advised you about fertility, etc?
Right better go and be socialable - and get ready for work tomorrow .