Stuggling to loose weight

I'm 23F ( 175cm and 87kg ) and trying to loose weight ( not that its working ) to better cope with my PCOS and Endometriosis and to also help with getting pregnant later down track, its not a massive goal getting down to 80kg would be ideal but 10-15kg would be amazing, I am currently taking 3x Metformin 500mg per day to help with my PCOS

I have an extremely active job where i am constantly moving and having to run ( i am a kennel attendant and get to play with dogs all day ) and on top of that go for 30min to 1hr walks everyday with my dog as she is a Cattle dog x Border collie, I also can't do extensive exercise like weights or Pilates due to having a spinal fusion

I do eat breakfast as im either not hungry or working, have light lunches ( a sourdough sandwiche or fruit ) have a small snack of fruit or whatever is laying around and dinner, My partner and I are currently struggling with the cost of living so sugary foods/treats, takeaway and fatty foods aren't something we get to enjoy often

Any help and advice would be amazing!