You don't know when you're truly going crazy... when it happens you may be able to remember it, but you won't be aware enough to stop it or do anything about it while it's happening. You might notice having delusions before you experience psychosis though. Like if your brain is feeding you information that seems really off, like people driving by your house watching you, etc. But when you legitimately go crazy you won't be able to control it.
Severe dissociation is certain kind of craziness I guess and there's a lot more overlap than what most people say.
My advice would be that you need to have valuable things to do in your life. The more time you spend doing nothing, the more you'll perseverate over the symptoms. Dissociation doesn't destroy your brain... at least not immediately, even though it feels like that. You just need to find something to do in life I think and have things on your schedule. No amount of thinking is going to make you "understand life." It's more about physical actions in the environment.
Truthfully, dissociation can make you go crazy if you go into it hard enough. Hopefully you can find a way to not do that because it's not fun or healthy for your brain. You'll get that piece of yourself back when your anxiety relents. The only way that happens is by acting in environment. If you can't accept anxiety and act in the environment, then you'll just end up dissociating into a dream world forever.