Discouraged :(

I'm not sure if this is a rant or what it is. But I feel so discouraged. I have the most amazing husband who works super hard, but he is ALWAYS tired, like more than normal. But we cannot figure out why he is so tired. My fear is that he will be tired like this once we have kids (we are TTC) and be too tired to play with them and spend time with them. He works super hard, which I am so thankful for. But I know so many other men who work hard yet have energy after work and don't always feel so tired. Anyone ever experienced this? Is it a lack of nutrients? other body issues? He is a fit guy, works out at home a few times a week, and has a physically active job so being physical is not the reason. It's frustrating for me because I don't know how to help him, and also discouraged because we've been TTC for about 9 months with no results :( Can someone pray for me? Or if there is anyone going through the same thing that would want to be prayer buddies? I'd love to know I'm not alone <3 I'm 25 years old, and we've been married for almost 3 years!