Are these mood swings normal for depression?

This happens about twice a day but I go from like an okay mood to a full-blown suicidal mood. The okay mood is not happy or normal. I still feel lethargic and not focused but I'm not imagining nooses all over the place. When I go into my suicidal episode, I imagine nooses everywhere, I start planning my suicide, including dates, places to kill myself, and things to buy. I feel so incredibly depressed that's my brain feels like it's pushing down on me. It's like all the happiness has been sucked out and I can't imagine any time when I was happy. I also lie in my bed like a vegetable and look up suicide methods on wikipedia. I don't answer my phone or IMs. Is this normal for depression to have mood swings?
 
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