Oh no! I'm sorry that you're sick AND alone on your birthday. That's not fair!
I know it's not perfect, but I think there's a (sort of) solution. You need a birthday do-over. Being too sick to leave the house qualifies for a birthday do-over all on it's own, but to have your family gone for the whole day too. Heck, you *deserve* to have TWO birthday do-overs this year!
Do you think your family would be up for picking a day to celebrate in a few weeks, once you've recovered? Maybe you and your husband could find something fun that you'd like to see/do (a show, a museum, a sporting event, a festival, a hike, a quiet picnic by a lake... whatever makes you happy!). He should take care of all the details (i.e. getting tickets, getting you guys there). And, there should probably be a nice meal (whether he cooks or takes you out!) with cake (and/or wine, ice cream, chocolate... depending on your tastes!)
Missing your birthday, and being sick, are still not fun. *hugs* I wish somebody had thought to bring you a big gift basket of nice things for when you're sick, or some soup. But, maybe you can still celebrate and have fun when you're feeling better?
Feel better soon, and hope you can get some rest today.
And...
Happy Birthday! 

