Will i be ok mixing drugs?

i have just taken 30mg of oxycontin and 10mg of valium-(diazepam) at the same time will i be ok....also i am wondering what the safe amount of magic mushrooms-(Psilocybin) is to take for a first time because i want to use it for meditation and try use it to induce an OBE-(astral projection) i weigh 80kg and am 28 years old....can someone help answer these two questions please....sorry i have not been clear on this i mixed only the oxy and valium to calm my panic attacks and the valium is prescribed to me but as for the mushrooms i have not taken it yet so thats why im asking...i dont want to take a huge amount i only want to try just enough to enhance my senses slightly and still be completely in control of myself...i have heard of people saying that 1gram of shrooms will be enough so im thinking that maybe i should only have a half a shroom and dilute it too...would this be more advisable...yes i know that all drugs are bad but im at the point in my life where i want to explore the un answered questions in life and think astral projection is the only way...i have tried to meditate and follow robert monroes OBE techniques but nothing is working...this is why i want to try shrooms