Hopeless in Ga

I am 28 years old, will be 29 next month and I have a 9 year old daughter. I met now husband a year later and we married two years ago. I was diagnosed with Pcos last year and have been on metphormin for a year now. We have been trying to concieve for almost three years. My husband wants his own child desperately and so do I but I feel like I will never be able to have another child bc I feel so hopeless after three long years. We have tried everything, pre-seed , you name it. I am always so happy for everyone else but lately I feel like I am a failure and the fact that everyone can get pregnant except me really bothers me . Is there any hope out there?