What to do?

I'm currently in week 10, and have been experiencing quite a lot of discomfort. This is our first and my partner has been very supportive, but some times when I tell him about some of my symptoms he questions if I'm imagining things or psycho-ing myself to feel bad. Even if I insist he still sound like he doesn't believe me and it's making me feel quite bad. I don't know what else I can do to convince him that it's not just all in my head!