Motivation a Advice needed!

I'm in need of some tips. How do you get motivated and stay there? I've lost my motivation over the past year since I've had my baby. I want to lose the weight I've gained and can't stay motivated. My mat leave is ending soon and I need to find a job (it doesn't make sense financially to go back to my old one) my siblings and my parents keep hounding me about it and SO is dropping hints without trying to be too pushy the problem is - I don't want to go back to work yet. I want to finish having my babies and wait until they go to school and then find a job. I know I can't do that so how do I stay motivated? Any tips you can give me would be great, please try and be kind.