That would explain why he waited so long to call 911. He had to hide something first. And he probably was hoping he can revive Michael so that no one will ever know what he had given him, because he knew he is GOING DOWN if anyone ever knows what drugs he used in a home setting. Also, IF he used Diprivan I'd really like to know if he just started his weird CPR right away or if he tried to get oxygen into MJ's body first and tried to get him to breathe again. IF he used Diprivan he should have AT LEAST had an ambu-bag right next to him and should have USED it right away. If he failed to get MJ to breathe and concentrated on MJ's heartbeat...then I am pretty certain he really had no idea about how Diprivan works.
Patients start to wake up once they don't get any more Diprivan. However, it takes time, and some have trouble breathing in the beginning and need to be ventilated by us until they start breathing themselves. We keep them intubated until we see they will be okay without it. Some will need oxygen via a mask while they are waking up because they aren't breathing adequately yet. The patients don't wake up with a snap of fingers once Diprivan is stopped. It takes time. (Depending how much they got...some need only a few minutes, some need almost an hour...patients react differently). And they need to be carefully monitored until they are fully awake. And with fully awake I mean, awake and alert. Waking up once for a short time and being able to focus or answer questions doesn't mean they're safe. They can still need oxygen after that while they "sleep it out". Most are fine, but we've had cases in which a patient dropped with their oxygen saturation to under 50% (we give oxygen if they go below 92%...), even though they already had woken up once. When they can sit and talk and are back to their usual self...that's when they don't need to be monitored anymore.
Why do you think he was injected in the spine? To make a certain part of his body numb? I think it's possible that he has those symptoms on Sunday and still appeared to be okay on other days, or even on Sunday too. If he got something and was feeling side-effects, it probably scared him. But not enough for him to go to the hospital. And obviously he didn't die then. But the symptoms were scary enough for the nurse to tell him to seek medical help. Maybe he just trusted his doctor again and didn't go to the hospital. And once the drugs wore off, he felt fine. It's possible. Don't know what happened and why he had those symptoms and if the nurse is telling the truth. All I'm saying is that it's possible he had symptoms, but still seemed fine.