problems concieving

Hi everyone. I'm new to this so sorry if I don't know any of the lingo. me and my husband have one healthy 8 year old son together. Have been trying for another for the past 5 years, with no luck.doctors say everything is fine, test come back fine. problem is, it's getting me down so much now. I have been put on tablets to help my mood, but I'm now worried about going to the doctors to see if they can still help. has anyone got any recommendations? experiance in this?