This is consuming my mind, I think of nothing else. Even though this is just a side-project and I still have a job.
My mood is different, and I can barely hold small-talk with my wife (serious talk is fine, it's a distraction). I hate it, it makes me want to stop it up simply due this. I don't need the money that badly that I'd forego my marriage. But I do it to create enough income that I can spent the rest of my life with her, and enjoy it, without worrying about working 60+ hours a week.
What tools do you employ to avoid overthinking/emotion/etc in side-projects?
The advice is simple honestly, keep things in perspective and don't stress over something you have no control over, just take actions you can to address it. The first part of that is the most important and part I forgot recently myself. Keeping things in perspective is critical, if your priority is your relationship with your wife and your primary job than that's where you focus your thought energy. Take a deep breath and put it in perspective, nothing Google or your side project can do should make you ruin those other two things.
The second part is in business you have to learn to let go of things you can't control. Now, that doesn't mean you don't take action or address it, but don't allow it to consume you because if it does you won't be able to address it and you'll make rash or bad decisions. Again, easier said than done, but if you keep things in perspective then part two is easier. It would be harder, but still the same process if your side gig was your primary income and you relied on it to pay the bills.
I am not trying to minimize anything, but it really is that simple overall. Accept those things you can't change, change those things you can and focus on your priorities. BTW -- accepting things you can't change doesn't mean you give up, just recognize you might have to do things differently to get around it. But you likely won't win against Google if you confront them, doesn't mean you shouldn't be digging and appealing, but I'd also be making other plans. See why the suspended it, was it a TOC violation etc, and fix it or adjust strategy.
Last point (and to your question more directly), this just happened so take a breath, don't knee jerk react this instant and give yourself a little bit today to clear your mind. You can't fix this is 15 minutes, and while important it isn't emergent since it is only the ads, so go take a run, go to the gym or do whatever you do and clear your head. I personally hit the beach, get in the water or get on the water (boat) or go work on a personal physical project (building something etc).