Am I being unreasonable?

I'm under so much stress. I've been trying to keep a lid on it, but I reached breaking point. Yesterday, I received some potentially serious news about My health. I won't know for sure till Monday. To say I am worried is an understatement. I've been down all day, I hardly slept last night. My partner said I hadn't been myself. Anyway, despite that, he has decided to go out tonight. Even though I said I was worried about the health stuff, he got all ready to go out, then got mad because I had 'all day' to talk to him about it (he watched footy all day and hardly spoke to me), yet he only asked what my problem was as he was getting ready. I have been bawling my eyes out, letting it all out. I keep so much to myself. He just remained mad that I had ruined his night. If it were him who was distraught, I wouldn't leave his side regardless of my plans. So he's gone out, angry with me. I never have problems with him going out. Just tonight, I don't feel like being alone, and I feel neglected and unsupported. I am never the stressed one - he is, and I'm the one who's strong for everyone else, but today I just can't be. This is not normal for me. Am I being unreasonable, or is he selfish?