Frustrated and Fatigued

My husband and I have been going back and forth about having a baby. We have had a couple of scares recently and just decided if it happens it happens. I am trying to be calm but he knows how much I truly want this. My biggest dream in life is to be a mommy. I just can't help to be utterly heartbroken every time I see that bfn. I just turned 30 and feel like my life is passing by before I have had a chance to live it. Haha patience has never been my strong suit. My cycle was due to start on the 23rd. I have taken 4 tests and all of them were negative. I'm extremely exhausted all day long no matter how much sleep I get at night. I just don't know what could be causing me to feel like this. I am taking prenatals and iron supplements. Obviously I'm not prego, however I don't feel normal. Has anyone ever been through this? I decided to just wait and see if I start my cycle before I take another test. I can't deal with the disappointment.