How am I doing?

I should be doing great...should be. I am seriously starting to think there is something wrong with me! Here are the facts;

Good things in my life right now:

1. I am engaged to the man I love.

2. We are looking for a house to live in together.

3. We are financially able to afford a house (which I think is pretty good for our age)

4. I am eating and sleeping great lately, resulting in me losing some weight, which never hurts!

5. I have a job that I am still enjoying-good hours and such.

6. I'm going to Guatemala in 3 weeks!

Things that I feel are taking over and making me feel stressed or depressed and I don't like it:

1. We can't find a freaking house that we like that likes us back.

2. There are 18 thousand other people getting married this summer (for some reason this is stressing me out beyond belief. Trying so very hard to get over it..)

3. There has been some stress at work this week.

4. I have to get a bunch of shots to go to Guatemala, and I can't get it together to go to the doctor/I don't have a doctor!

There are more items that belong on both of those list, but I don't want to keep you here forever. Basically, I should be having a really fun, exciting time right now and enjoying life. But I just can't seem to get it together. More often than not I feel angry, and bitter towards someone or something. Instead of feeling excitement I feel resentment and lost hope. Though I have been supported a fair amount I feel abandoned alone. What is wrong with me? I'm going to blame these feelings on the winter and pray it vanishes in Guatemala (if I don't die because I don't get my shots on time..)