Like someone hit a baseball into your throat, as it travels slow like molasses down the esophagus. Then it just lurks in there for a while, until it reaches your stomach And once it's there, it remains. It grows long spikes, and longer those grow, then they churn in the basket of your tummy. Ripping apart each entity while it resides.
Eventually it vacates, only to lurch back into your system, reverting back to old ways.
It poisons your thoughts; it fills your head, and it expands until you blow up on someone. That's about how it feels.