I feel like giving up!

Not sure why I feel this way but it seems that when I think I know my body it strays away from me. Playing tricks and changing things. I’m just so fed up with wondering or thinking am I to old. Do I not have enough eggs or are my tubes blocked. All the things that run through my mind. But yet, all I’m trying to do is conceive my second after 13 years. I’m feeling hopeless and every time we are in our TWW my husband always says the baby in your belly needs good food. Or something super sweet about the baby in my belly. In my head I’m thinking, the one that isn’t there!