Trying to ttc for almost 8 yrs

My husband and I have been trying for almost 8 year to have are second child. It starting to get to me with my depression. We have one child together but we want more. These last few month my Dr told me that I have pcos. I am currently taking metformin. Is there anything eles out there that would help us??? I. About to give up trying. I have 3 miscarriage. I just dont know what to do anymore.