Couldn't stop laughing

Hi, so this is my first post ever and I desperately need some advice. I'm a newlywed just married in January, but my husband and I have been together 9 years. Tonight he tried to initiate sex, which is not like him, but i was not in the mood at all. And he's not the type of guy to get into foreplay, well while trying to get in the mood I couldn't stop laughing! I was hysterical, eyes watering, belly hurting laughing. I feel bad, but in my defense I did warn my husband that I was not in the mood. I work in Healthcare and have been super stressed at work, to add on my husband was laid off, and we've been kind of distant the past couple of weeks so sex has been the last thing on my mind. Anyone have any advice on how to get in the mood and make it up to my husband???