David Kessler explains that feeling like you're losing your mind while grieving is completely normal. When you lose someone significant, your sense of balance shifts fundamentally. The absence of this disorientation would actually be the unusual response.
Is it normal to feel like I'm losing my mind while grieving?
It's very normal after a loss when you're grieving to feel like you're losing your mind. The rug's been pulled out from under you, the earth has shifted in a way that you feel like you've lost your balance completely and possibly forever. So just know those are normal feelings that everyone has, and it's to be expected. In fact, it would be the opposite. If someone you deeply love died and it didn't feel like your world was shattered, we would wonder, why aren't you having these feelings? So just know, as uncomfortable and out of control as they may feel, that is what happens after a loss.
