I can understand your mindset, because I remember being 17 and feeling invincible. Then I overdosed. Anyways, I'm just glad that you aren't ignoring my words.
You will not see hallucinations. Instead, you will see delusions. You can discern reality when you are hallucinating. When you are dellusional, you cannot see reality and honestly believe what you see is real and I can't describe how miserable that can be.
See most LSD and what you think of produces hallucinations. Walls may begin to breathe, tracers on lights, etc. You will not see a little leprechaun running around but ass naked while under the influence of LSD. It's nothing like you would imagine and impossible to describe.
I assume you are worried about acting normal around your parents. I'm honestly not sure if dosing DPH that high would make you act weird or not, I'm sure 300mg would. When you took 150mg did you do it in front of your parents? I'm telling you, the last thing you want to do is to be delusional around someone like your parents. You will likely end up in a psych ward.
Dose 200mg tonight. If you are worried about your parents, then wait till they go to bed. Lay down in your bed and do not leave your room for any reason at all. Just know that you cannot leave your room.