Opportunities will come up again, but this would be an ideal time as DD is very flexible, DH would happily give up work, and then by the time we get back we might be ready for another baby. If we wait, we will probably have to wait until after having another baby which will be quite a few years as I can't go on maternity leave while away. Also, the real benefit is that we would be able to save lots of money for a deposit for a house when we get back.
The downsides would be leaving our friends. And the real problem with my mum is that she hates flying and is really funny about going away. She is a real homebody. She said to me the other day when I was staying with her "you have to understand I'm not getting any younger" She only 5 years older than DH FFS, she's 47!
The thyroid thing I kinda knew would happen at some point. My mum has autoimmune thyroid disease, but it led to underactive thyroid, which is why I am so surprised. So I need to find out if it's an autoimmune thing or a post pg thing. I thought overactive thyroid was supposed to make you skinny !