It is sad that both of you are showing infertility
factors. First thing is get over this depression
and try to find a good doctor for your wife and yourself. she may visit a gynaecologist to regularise her periods and then start ovulation causing medicines. AS per you, see a urologist
who can prescribe something for your faltering sperm counts. If things dont turn up well after a year or so, you may opt for IVF.