That is why the poet thinks it may be better that he cannot find the windows – which are the causes that has to search and deepening in them – because, as he says, he may then be confronted with issues that he would rather not to know or has not to realize. Perhaps, the poet says : to find windows, to be finally a new state of the feeling of pain, and the truth that he wants so much to find, to be the cause of a crucial battle with himself, and this may, instead of rescuing him, it will bring him a greater agitation.
I think this gets very close to an ultimate issue that divides people who interpret Epicurus differently. I can certainly understand that there are times and circumstances where the pain of life is just so overwhelming that it seems like nothing is worth doing other than escaping agitation. But as bad as I feel for such people, I don't think that such a worldview is necessary for everyone in every circumstance, and I think Epicurus was part of the segment of humanity who sees life in Jefferson's phrase - "the greater part of life is sunshine." We can't measure the sunshine part in terms of length, or in any specific terms at all, other than that we FEEL that part to be why we are alive and how we want to spend our lives.
Those of us who see the world that way bear no ill will against anyone else who wants to focus on the dark side and the escape to what they want to call "tranqulity." But that doesn't seem to be a two way street, because many people who are focused on escaping from pain see those who are not so focused as an affront to themselves, and so they work very hard to invent all sorts of ways to "prove" that pleasure is an impractical guide to life, and that there are things in their minds that are so much more "worthy" than the pleasure of themselves and their friends.
To me it is no coincidence that both Nietzsche and Liantinis saw something important in Epicurus. I don't think either of them developed the connection deeply enough, but both of them express the depth of feeling that is (to me) the end result that is compelled by the Epicurean worldview.