My husband thinks I'm depressed

So I'm 8 weeks and have been dealing with all day nausea and exhaustion pretty much since my BFP. I sleep or nap a lot, and I was never a nap person before. My husband thinks I'm depressed and that's causing fatigue, and I keep trying to tell him I'm not, it's hormones, but he doesn't believe me! He says depression is a "physical thing" - but TBH the only thing that is bumming me out is these damn symptoms! 
It's so frustrating and upsetting because I don't feel like my symptoms and feelings are being validated. 😢😢