I am 22, and I drink a lot of alcohol

This might be a bit of a longer story. Currently, I drink about 3 days a week, usually is every other day, and only ever at night. I start around 8-9pm CST to around 2AM, and I tend to drink a 5th of vodka/rum, but very cheap shit. I have been doing this for around 1.5 years. I am currently 22. Do I need to worry about withdrawal symptoms if I just stop? I have very small problems when I stop for a week. Only shaking towards night time. But I also have many medical problems and extreme anxiety. Is this something I need to worry about?

I have also randomly gone 2 weeks without drinking and had no serious issues. Recently, I took a week off, and I ended up having a seizure. This wasn’t even a long time that I took off from drinking. Is it possible to have a seizure 7 days into stopping? As that is when it happened. I have read about it being within the first 2-4 days. Do I need to worry, especially if I have many medical issues?

I am sure I can just quit whenever I feel like (which will be soon) as it never was overly difficult for me in the past. But am I risking having another seizure? As I feel like having a seizure 7 days after quitting is quite uncommon. Just looking for ANY and ALL advice when it comes to alcohol, withdrawals, how to help myself ETC. Please share ANYTHING.