Unable to lose weight

Hi all. I am 25 & have been heavy all my life. I have been dx with pcos. My labs have all come back ‘normal’. However I cannot lose weight. I don’t exercise but I do stay on the go and active in the garden etc. I can lose 3 lbs and be back up 5 lbs in a couple days. There’s really no rhyme or reason. It’s very frustrating. I don’t eat wonderful but I feel like i don’t eat enough to justify the weight. I do take metformin for pcos and mainly just as a preventative. Is there anything I should talk to my dr about? It’s very hard as I feel like I’m just stuck and can’t go anywhere but up.