Month after month...nothing

Does anyone else feel really disappointed, every month it feels like this will be it this time, then you are let down again. It's so hard to not be counting and caring and obsessing all the time. I feel like TTC has consumed my life and I'm constantly wondering when it will be my turn. 
Every month I change something and think I am improving, taking a different medication, adding more exercise, taking better care of myself. 
Any of you ladies feel this way? Do you ever feeling giving up? If not, how do you overcome?