What the hell is wrong with me????

I have 2 kids and my fiance have 1. None together. I had a miscarriage March 2016. After I lost the baby I decided to do the gastric sleeve in July of 2016. I been trying for ever and we just can't conceive at all. I'm wondering if this is due to the gastric sleeve or because his thyroid issues because he have graves disease. Can anyone shed some light I'm getting frustrated now???? I know you are not doctors but can anyone relate to this??