Stop trying? Input plz

I have pcos and cysts on my ovarys me n my so have been trying for 2 years and everytime I think I'm prego and have my hopes up a comes or I take hpt and blood tests and they r neg this time I was 2 weeks late with sore breast and ended up not being pregnant and they think something is wrong with my boobs I even had to get a mammogram trusday ... still waiting for results I have never cried at a doc office before and that time I did I cried for about 2 hours and it just makes me want to stop trying but we want nothing more then to have a baby :( venting over any input would be great