Tried alcohol for the first time and now i have anxiety…. scared

I tried alcohol for the first time on 9th May and slept well but due to dehydration i was losing breath when I was about to sleep .Now it’s been 4 days since that episode still when about to fall asleep the body gives a jerk ,sometimes breath slows down and stops . Have not slept well for only 2-2.5 hours of sleep . Also took an anxiety pill on 10th may ( Slept but woke up tired , heavy head ) . Is this normal and can a person get insomnia by just the first time drinking ( Also don’t have a history or anxiety)