Why is my metabolism so horrible and how can I make it better?

I am s frustrated I can;t lose weight. I was about 145 in november, which was still a little too much, but it was consistent. (My heakthy weight is about 125-130, im 5'7). Now, after losing my job and sitting around all winter (yes kind of depressed) I am at 175. I used to have a fast metabolism but clearly not anymore. I have been eating super healthy and smaller portions to try and lose the excess weight but it just wont budge! I eat a healthy amount (maybe 1500-1600 a day) and throughout the day to keep my metabolism going, i wlak everywhere, land im starting to lift small weights but starting small to work my way up. I cant run because of an ankle injury and I cant afford to join a gym. I literally eat salads, yogurt, whole wheat vegetable and chicken wraps, grilled chicken burgers, fruit, and veggies and have pretty much cut sugar out (and i used to eat a ton of sugar and was smaller) and it still wont go. I feel like my metabolism is ruined. I drink matcha green tea to try and speed it up but still nothing. I am so sick of being so healthy and seeing literally no results. I dont want to have to starve myself to lose weight, and i tried no carbs but hated it cus it was too much meat (i eat only healthy carbs in small amounts). I also take a good multi vitamin and omega. What could possibly be going on with my body that my metabolism is so horrible? Ive had my thyroid checked and my doc says it;s fine. I do everything experts say to do to get the weight off and it still wont, and im getting really upset. Is there anything I can do to boost my metabolsim back up to start burning more calaries so i can still eat healthy, be satisfied and feel good? Any supplements I can try taking with my healthy diet and excersise to help boost results and maybe supprese my appetite a bit? (I know diet pills arent always good, but i am talking about mostly natural safe ones-no hard core stimulants or anything). I am not in starvation mode nor am i over eating so i need to know why i am stuck at this horrble weight. (btw Im 27, female)