Thanks, Dieu. You're right, I do just have to wait to find out... but I hate waiting!
Pavonia I'm not sure, would I consider a ONS with Mr Young Hottie if he was single or am I only after a relationship? I've never had a ONS before, but I am actually tempted. I've been single for ages now and considering mooseburgers. 
You're right about needing to find out as soon as possible whether he's a free man or not. It doesn't matter whether he's in a shit relationship, if he's still in a relationship, there is a girl code to not break.
Lovemusic33 I'm not even sure if Mr Young Hottie counts as an iron. Will find out on Wednesday! I might not consider it if I didn't know him from RL. With OLD, irons can vanish easily because they can give false information/no information - I have friends in common with this guy.
I agree with Bant that you need to work on your own self esteem. What do you like about yourself and your lifestyle? If you care for DC with SEN, you must have a phenomenal strength of character and compassion is actually quite an attractive quality. See the positives in your lifestyle rather than the negatives. What makes you you and why is it so awesome?
What do you like about your looks? You don't have to write it down here, but have a think about it. I bet you have something going for you that not every other woman has - I mean, I have far too many wobbly bits, but the flipside is I have fantastic boobs. We all have good features as well as the flaws. By remembering the good features and drawing attention to them, the flaws seem less obvious.
To someone, you are a catch. Just have to find that someone! Might be this iron, you never know!