To those that have used one or both of the mentioned drugs, do you have severe personality changes, cognitive changes, or long lasting health problems as a result of taking them?

I feel a little bit out of it for a couple of days after taking DXM (and other dissos), but that goes away. No long lasting health problems, but that is with very infrequent use.

And what can substitute this void that I am feeling?

Drugs other than DXM and DPH. Like sure those get the job done if you are desperate to trip, but other psychs and dissos will do a much better job and feel less toxic on your body. You say you're home stuck and awkward but honestly most drugs are super easy to source on the darkweb. I can't tell you how or I will get banned but I promise you it's super easy to figure out if you do your research.

Meditation, exercise, sleep, and healthy eating will also fill the void. Also yeah hobbies.