In Darchen, the author was in poor physical condition. He had a bad cold, his nose was blocked, and the high altitude made him short of breath and unable to sleep properly, which left him feeling weak, tired, and miserable.
\[ \text{Physical Condition at Darchen} = \text{Bad cold} + \text{Blocked nose} + \text{Breathlessness} + \text{Insomnia} \Rightarrow \text{Exhaustion} \] \[ \text{High altitude} \rightarrow \text{Breathing difficulty} + \text{Worsening of cold} \] \[ \text{No proper sleep} \Rightarrow \text{Weakness} + \text{Low energy} \]
Thus, the combined effect of illness and altitude made the author’s physical state in Darchen very weak and uncomfortable.