so i was cleaning my bike and i was tightening some screws b/c there was this weird craking noise from my headset/stem. so i fixed that but now there is some weird motion going on

if i stand in front of my bike and place the front wheel between my legs, tight, and i grab my handlebars: when i pull the bike towards me fast, there is this weird motion from my fork/headset/stem area. it shifts a bit. is this normal. i never noticed it until now.
help me, i really don't want to die