Husband not supportive

I was diagnosed with gestational diabetes but my numbers were only slightly elevated. It doesn’t matter though, I still have it, I was over the cutoff. My husband has been so dismissive saying I’m over reacting, I probably don’t even have it, and the test probably isn’t even accurate. I feel so unsupported. His mentality is so what, you watch what you eat for 2 months, big deal. He doesn’t understand that this is a huge lifestyle change for me, it’s overwhelming and it can have serious consequences for me and baby. I’m sitting here crying because I feel like he doesn’t even care and he just dismisses my feelings and denies that I even have it. I’ve explained to him all the things that can happen but he says “your numbers weren’t even that high you’ll be fine” he doesn’t seem to understand that I still have it and it’s still serious. Any advice on how to deal with this? I can’t handle him minimizing things that are a big deal to me anymore