Greg sighed and watched the other man cuddled in under his blankets, almost looking like he was hiding. He took the empty glass and having seen how SHerlock had been gulping the water down, he got up and went to refill it. He was pretty much clueless as to what to do to help the man. Sure, John would be able to get him back together, probably even in no time at all. But he had promised not to call the friend, and Sherlock was an intelligent man. He was aware that John could be doing much more that Greg here, but he hadn't told him anything, so he obviously didn't want him to see him like this.
Returning to the room, he placed the glass of water on the bedside table and sat down at the edge of the bed. "Feeling a little better, yet?" he asked softly, eyes fixed on the man under the blankets. Seeing the proud, arrogant Sherlock like this... Greg couldn't stand it. "Look,.." he started, not really sure what he wanted to say. "I.. I really want to help you. But it doesn't seem like I am actually doing anything right here. Maybe you shoud consider telling John after all, he knows..." he trailed off, not sure whether he wanted to say 'he knows you a lot better than I do.' or just 'he knows what to do in these kind of situations.' 
Greg sighed again and turned around, looking out of the window. The weather had worsened. It was still daytime but the clouds made it seem like late afternoon, if not evening. Just kind of more grey and depressing. He was sure it would start raining soon. He would have to show up at work sometime again as well. And it seemed Sherlock was in no condition to help out, which said a lot about his condition and only made Greg worry about him that much more. "If you want to be left alone for a while, I would understand. You just have to tell me and I will leave, for now." he offered, not really being earnest, because he really didn't want that, but still.