Want to get opinions on whether I am being unreasonable as DH and my family all think I am 
I am currently 6 months into my first maternity leave, and have been offered a large promotion when I go back to work.
It's such a big step that I'm a little bit scared (especially since I would have been off for 14 months prior) that I will have lost my ability to work at the level I am now, let alone a higher one.
Another issue I have is that if I don't like the new role or suck at it, I can't leave for 12 months otherwise I will need to pay back my enhanced mat leave (full pay for 6 months and they also offer half pay for the following 3 months so it would be a sizable amount to owe)
Third biggest flag for me is increased travel, I enjoy traveling and have already been on a few flights with DD already but it would be international travel at least once a month, with a strong likelihood of an international move in the next couple of years based on how they see the role progressing.
DH thinks I am selling myself short and doubting my abilities, he is also shocked I would snub such a large pay rise (currently earn £80k a year and the new role is on £150k a year plus 20% bonus, car allowance etc.)
My family and friends all agree with DH but I just have such a niggling doubt on whether this is the right move for me based on not knowing what I'm going to be like at work after mat leave, what if I get epic baby brain and can't even type a coherent email! The new role also involved people management which I have never done before and not 100% sure if it's for me either.
So AIBU to 'waste' this opportunity or are my concerns valid/would you take it?