I was going to ask if you were depressed, KC, but you've answered the question. You do sound a bit down. Motivation is really hard when you're feeling depressed; I don't know about you but when I'm down I just never feel that I'm worth the effort of looking after myself.
Is it too simple to say "Get thee back on the Metformin"? Probably ... but I shall say it anyway. If you are insulin resistant then you aren't doing your body any favours by not taking the medication. Presumably the medication helps with that and the PCOS? Has to be worth continuing with, surely?
I'm a fine one to talk because I am a bugger for not taking my thyroxine when I feel well ... and then I look at the long list of problems that I could cause myself by stopping, and I feel pretty damned foolish for not taking them. I don't know what the consequences of not taking your Merformin are, but it might be worth thinking about that.
It's hard to exercise when you are in pain, but I think it's helpful if you can do some exercise at least. Makes you feel better, gives you a more positive outlook - it's a really good pick-me-up when you feel a bit down. Is there any exercise that you like which doesn't put pressure on your ankle? Swimming, maybe? I suffer horribly with my knees and it's hard to find any exercise which doesn't aggravate it, but I do find that without exercise, my weight-loss efforts always come to nothing.
My biggest motivation is my daughter, and I know I'm crap at losing weight but she is the reason that I know I must do it. I want to be around for her, to see her growing up. I want to be fit enough to keep up with her and not be huffing and puffing along at a snail's pace while she's itching to run off. I don't want to be an embarrassment to her ... and I know that I am. Taking it to its most extreme, I don't want to drop dead with a heart attack and leave her without her mum. Maybe thinking about your lovely little boy and all the fantastic things you want to do with him and for him might motivate you?