DXM: Death Trip........?

Just started doin DXM 3 days ago. First day I did 16 triple c's, 2nd day i downed 2 bottles of delsym, 3rd day(today) i downed another 2 bottles of delsym. Each time I tripped I felt like I looked death face-to-face, it was surreal, and yet it felt as though everything was TOO real. (if that makes sense) For a first timer did I do too much, or come close to "frying my brain"? I don't want to do this **** anymore, I just want to know what exactly was going on these past 3 days.. I learned a lot about myself and life in general. This has felt like one giant trip, 3 days of DXM in a row, not to mention the backlash comedown of the drug(I get higher and higher until I peak, then I slowwwwwly descend from my high). For the safety of myself and my peers, if I/we choose to experiment with DXM some more, what methods would be suggested so that nobody O.D.'s or "fries their brain"?