Sam shook his head. He was used to Cas's deflections by now, but it wasn't how he worked. Being under the influence of a drug was only going to confuse him even more, and he didn't want to delay the part where he sorted out the mess in his head, which meant he had to face it head on and grapple with it as much as he could.
A big part of him wished he could convince Cas to do the same, but he wasn't going to make him do anything that he didn't want to do. Sam wanted, needed, to heal. Cas needed to get to that place for himself before they could make any real progress.
"I'll pass," he said simply. He moved over to the couch and sat down heavily. It felt strange to be in this apartment, which had been so homey and familiar to him yesterday. In his mind, he felt like he'd been detached from any sense of home ever since Dean had disappeared from the bunker. That home had been ripped out from under him just like all the others. It was probably just a matter of time before... no, he didn't need to be thinking about that. "Just come over here when... you're ready."
Words seemed to be in shorter supply for him, now. He'd gotten unused to using them, especially in regards to relating to other people. Too many of them hurt, so they were easier not to say. But he needed to break back out of that pattern and not let it pull him under. It was going to be an exhausting uphill battle to get back to where he'd been just twenty-four hours ago.