Welcome to your dirty thirties my friend.
Some unwelcomed advice for you on your questions:
Job satisfaction: don't wait for a job you will enjoy. If you're driven to succeed, every job will have things that drive you crazy. Particularly if you're type A, and are intelligent. It's only normal. Look beyond that, focus on what you can accomplish, over-celebrate wins and derive satisfaction from them; don't dwell on losses or setbacks. It's a job at a company; they're not loyal to you. Be loyal to yourself. If you don't like it, find something else. But in simple terms, you'll probably never be happy unless you become an entrepreneur. But prepare to devote your life to it in order to win. Then you have to ask; do you have the nuts it takes to sacrifice all to win. Not an easy answer.
You get fired: big deal. Lots of people get fired...millions every year. You have only four choices: quit, retire where you are (good luck with that one), get fired, or die in the chair. Option B and D are essentially the same, and are unlikely. So prepare to quit or be fired. No shame in that. Your real question: have you prepared yourself with a guarantee of employability (not employment - employability). Is your skillset beyond reproach? Are you elite? Have you backed yourself up with an MBA or similar advanced degree that future employers will appreciate? Are you advancing where you are? If not, yes, you're in trouble, and you should worry about addressing this.
Should you save more: Yes. And when in doubt, the answer is "yes". Always save more. The problem with the economy and most individuals is lack of savings. This has been lost on Gen X going forward. 13 to 18% of your pre-tax income should be saved in appropriate vehicles. You're young enough; think aggressive. But when in doubt, invest in ETF where managemetn fees are minimized. Diversify: invest according to the global market cap value of various countries (i.e. spread yourself out across the globe). Put 80% in stocks, 20% in bonds...those sorts of rules of thumb for someone your age. Let compounding do the work for you. If you're savvy, do better than what I've recommended...good luck.
Then, having taken care of achieving or working to achieve those goals, enjoy today. Tomorrow is promised to no one. Don't die tomorrow having wasted today.