Step-by-step explanation:
The literary technique used in the passage is imagery, specifically visual and tactile imagery. The phrases "darkness is so thick" and "weighs so heavily upon me" evoke a sense of suffocation and oppression through the use of sensory details.
This reveals that the speaker is experiencing a great deal of emotional or physical distress. The use of imagery suggests that the speaker feels trapped, overwhelmed, and unable to escape the situation they find themselves in. This could be interpreted in a variety of ways, depending on the context and tone of the larger work.