When something good happens to you or when everything is going good in your life, how do you deal with feelings of uncertainty?

As a single parent, I’ve had my fair share of struggles. Now, I can say that I’m truly blessed. I have a roof over my head, I have a car that gets me from point A to point B and I have a beautiful son who loves me unconditionally. I have a job that I actually like (even though I hate my salary), I’m not scraping just to get by, and for the 1st time, I finally feel at peace. I’m not where I want to be, but I’m also not where I was. I would like to live in a bigger and better place, to drive a better (less crappy) car and to be in a loyal, faithful, commited relationship. Of course, I know there’s more to life than just these material things and as I look back on what I’ve been through, I really shouldn’t complain. But for some reason I feel like a storm is brewing. I pray about it all the time, but is this normal? Do any of you ever feel this way? How do you prepare for it? How do you handle it?