Hi there! Let's focus on the morphine since it's the closest one you can get to CTB.
Morphine sulphate have LD50 (lethal dose for 50% of population) by
600 mg/kg (oral, mouse). Reverting the
LD50 from mouse to humans is 600 x 0,081 = 48,6 mg/kg, can be roughed into 50 mg/kg. Assuming you weigh around 70 kg, you only need 3,5 g morphine sulphate for it to work (assuming that the one you get is pure one).
So no, that is not enough for you to CTB.
Sorry about your experience, we can get you some emotional help by venting here.
Please don't torture yourself with failed OD.
IMO you should not be here mate, this is an adult-only forum.
If you have any more questions you can ask here. Thanks!