Too much pressure

Since what happen to me recently, I have found making new friends has been very difficult, and I don't feel as though I am appreciated for my skills. In fact, I feel undermined and ignored. I dread going to work, and spend my day "clock-watching" and feeling like a fish out of water. I am finding it hard to make friends, even though I'm often approached by people for a chat. I should not feel this isolated! I feel as though I have lost my confidence completely, whereas before I was a very assured and confident person. On top of this, my relationship with my fiance has become strained since we started to have problems with his younger brother.

All this started before our engagementand it was like a year ago or more. I feel so pressured that I'm starting to lose control of my emotions. Am I cut out to make changes like this in the state I'm in? I am frightened because I have been planning and wanting to be exactly where I am at this moment in my life for years, and now I find that I can't cope with it all. If I were to leave my job, I would need to give a months notice, which means I can't get out of there that quickly. What is wrong with me, and why am I so unhappy? Why has my life gone so wrong?