Patience in the face of disappointment

This past week I applied for a customer service rep position with Wellpoint, a health insurance company. I would have been handling customer issues over the phone. It was a good opportunity--the pay started at $11.59 per hour, which would have been a pay cut for me, but there was room for advancement. I can't get another raise where I am now. Also the hours would have been Monday through Friday, 8:30 am to 5 pm. I thought, "Oh..perfect!" It also would have gotten me out of retail.
I got to the point where I was scheduled for an interview. I was supposed to have that interview today, but they called me two days after I scheduled it and cancelled it because the positions were filling up fast. They then told me that I could continue to apply through Kelly or Aerotek services as a temp. Well, I wasn't about to do that.

Sometimes I feel like I am going crazy staying at this job. I don't understand why I'm not doing something else, and I've told God this. I'm glad He's got more patience than I have, because if I were Him I'd be sick of listening to me complain. So I had to swallow my disappointment. The same day, I was reading Lamentations when I came across this passage:

The unfailing love of the Lord never ends! By His mercies we have been kept from complete destruction. Great is His faithfulness; His mercies begin afresh each day. I say to myself, "The Lord is my inheritance; therefore, I will hope in  Him!" The Lord is wonderfully good to those who wait for Him and seek Him. So it is good to wait quietly for salvation from the Lord. And it is good for the young to submit to the yoke of His discipline. (Lamentations 3:22-27)

If anybody had reason to complain, it was Jeremiah. And complain he did! He watched his people get sent into exile, his homeland completely destroyed.  "The thought of my suffering and homelessness is bitter beyond words. I will never forget this awful time, as I grieve over my loss." (Lam. 3:19-20)
And yet he hoped. He knew that God's deliverance was on its way, even if the timing wasn't Jeremiah's.  So I'm trying to take an example from Jeremiah and be patient.