There was a few times where Erik had to step out of the hospital all together. Especially when it was getting to the point where he felt like he was suffocating or that he was going to get sick. However he always came back sitting beside Raven. It was far too many hours (even if it wasn't really THAT bad) when they got the updates. Just as it had taken far too much control for him not to snap when they told them that they'd have to wait longer.
For a moment he can't even fully step into the room his eyes transfixed on Charles. On how pale the telepath was and all of those wires and cords. Its a good few more moments before he moves to the other side of the bed taking one of the telepath's hands in his own, running his thumb along the back of it.