Sad and Stressed

Rachel
It's been 7 days since I was supposed to get my period and nothing.  Of course I've taken tests and the results say NOT PREGNANT.  The devastation is unbearable. 
About a year ago I had surgery to fix a polyp and my period didn't come back for months, so I had a chemically induced period.  Finally, they started coming back normal on their own but this month...nothing.
My husband and I are desperately ttc and yes it's been hard to get my period every month, but at least I was getting it.  It gave me hope that my body was functioning normal again, but now I have nothing.  
How does everyone stay positive? I feel like I'm living in hell.  Thanks for listening and please send a prayer or two my way. I could use some encouragement. 
Rachel