I'm sorry I have no advice as such because DH is fine in that department however I have PCOS so I went to a Chinese medicine man to help with my fertility. He gave me herbs mixed for me (each person has a different balance depending upon their issues etc) and acupuncture. We ended up conceiving on my fourth month with the treatment however that lead to a miscarry but then I got pg again the following month and our DS is now 12 mths old. Have you thought of trying alternative medicine in conjunction with what ever treatment the FS recommends. In regards to weight, I was over weight and lots 7kgs before I fell pregnant.
I wish you both all the luck in the world.