From my perspective your writing is getting better and better. Another poem i truly love.
The first few lines speak of loneliness but of contentment as well. It's almost like you are saying that you feel comfortable being alone and you are your best when alone.
You used the last of your energy to try to calm the darkness in your mind? Of the room you slept in? It could be a million different possibilities left to the imagination of the reader themselves.
Again you continue the story of healing with being alone. I love the description of the lines between the woods and the bottles of the sea. A lot of it kind of reminds me of feeling depressed and feeling like you are at rock bottom but you spin it in a positive way by not saying you are lost but finding yourself in the woods. And the notes you found could possibly be metaphorical notes or poetry you rediscovered.
In the last few lines you talk of peace within but war is difficult. You are content but not content at the same time. You have happiness but you have been sad for so long that it becomes part of you and