It seems to me safer to calm the mind with meditation and contemplation. Even restricting food, as in fasting, seems a fairly safe thing to do ( probably good for our health as well!)
In all the above, your experiences might be said to be genuine, whether you call it spiritual or not. Taking drugs would seem a less reliable way to reach any real conclusions. After all any fool can take drugs!
Personally, at a young age (15) I found that Yoga breathing and meditation enabled me to realise the Oneness of Life, or Unity. There was even, after a couple of years a 'realisation'. Was it true, or not? All I know is that it altered the course of my life. At 74 I look back on a varied and interesting life, which changed dramatically at age 40, without any such 'spiritual' practices.
Having been wholefood vegetarian since age 17, I can point to a virtually disease free life ('flu once as an adult). Although now a firm atheist I am fascinated by the way religions have developed, divided and been interpreted and misinterpreted over the years.
I cannot pass on any experiences of drug use, as I have avoided all such as alcohol, tobacco, tea and coffee, as well as the ones which are illegal etc. When reading of others lives, I consider myself to be very lucky- is there such a thing as luck, or do we make it ourselves? I consider that I have lived the equivalent of about three lives already, and I may live even longer. At present nothing major is going wrong, as in aches and pains, stiff joints etc. No- it's not down to yoga! It changed my life early on, by opening my mind towards respect for others and all creatures.
Even simple exercise, like walking and dancing, creates all the hormones and other chemicals within my brain and body that it seems to need. I never get a hangover or 'downer' as after alcohol or drugs.
Because I am a new contributor to this site I am not permitted to put a link to a Facebook Group, started by other people, about part of my life and activities.