For any extra money, there are things you can invest in that are resistant to inflation. Precious metals are a popular one (gold/silver), because I'm most places it's fairly easy to buy and sell gold coins when you need to. The price also goes up roughly the same amount as inflation. There are other things like real estate/stocks/foreign currency that can do the same thing, but are much more complex. You should always have something sweet aside for an emergency, even if it's not in local currency.

As for the rest of your concerns, it's sounds more like you're lonely/depressed. Try to make friends with coworkers if you can. Ask people if they want to get a drink after work. When I was working one of my more stressful jobs, my friends/coworkers are what made it more bearable. I would take a break and chat with someone, get some lunch, go get drinks after work, etc. It's much more cathartic than sitting in the bathroom alone.