You would definitely know if you had a crash in the same way you would definitely know if you survived getting hit by a train.
Someone recently described it as feeling fine one day, then feeling worse than you ever thought possible the next. Sounds appropriate.
I went from feeling very energetic for the ~18 hours I would be awake during a given day, and very horny and happy, to panic attacks several times a day as if someone had a gun to my head, waking up in the middle of the night sweating profusely with tremors and hot flashes, having body-wide pain (flu-like) and barely being able to force myself to get out of bed in the mornings, then slamming into walls on the way to dribble out the first bit of urine of the day. This paved the way for a day at work or school feeling as if I could barely hold myself upright. This is was also in addition to feeling like part of my brain/soul/personality died and feeling like the connection between my brain and penis was severed/removed. It took less than 24 hours to become something completely different than what I was before.
It was pure Hell and I thought I had been poisoned or developed cancer and was going to eventually die from whatever was happening. …I was poisoned, in a way.
If you have to ask, then you didn’t crash, but might have developed side-effects (or withdrawal effects) slowly.
Some people describe going through a spell of bad symptoms, or having one or two new ones emerge, as a crash. …Not even close.