fertility treatment. ugh

After first round of letrozole we just had our appointment this morning to see if I had large follicles and well I have plenty not big enough "yet " on my right ovaries but my left there all perfect but since my left tube is into rely blocked there no good!
And my uterine lining is thin. 
So they want me to take estrogen pills and give my Gg's a couple more days to see if they will get bigger. 
I am running out of hope and faith. 
Almost two years of trying to conceive and now I am begging to be mentally exhausted. 
It's been a long journey.