Momma of 1 looking for help!

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I'm trying so hard to be commuted to this. But I suck at it!!

I have lost 53 lbs since having my daughter 3.5 months ago, not by me doing hard work... But because I have severe hyperthyroidism. Anyways I still need to lose 43lbs to get to my goal weight!!!

I've been adapting a healthy eating regime, but I could be doing better. I can never find time to work out between caring for my almost 4 month old, volunteering on the school board and working part time for a family with 4 kids plus mine so 5.

I always give up, my husband doesn't believe in me doing this anymore because I don't try.

I wanted to try the 21 day fix? Any luck?
I don't know what to do :(