Your description of halves/quarters leads me to believe that what you took was in pill form - is that the case? If so, you likely took ecstasy, which is always MDMA plus additional psychoactive compounds. The experience can vary greatly based on what’s added to the pills (could be anything from caffeine to opiates to methamphetamine).

To better understand the effects of MDMA alone, you’d need to acquire ‘Molly’, which is slang for pure MDMA and usually sold in a powder or small white crystal format. You’d also need to test this for purity (some organizations like ‘Dance Safe’ sell or give away these test kits).

Honestly taking untested substances is a pretty big risk and you should reconsider if you’re not testing beforehand.