are these withdrawals possible or is it anxiety?? please help

I am a 21 year old male, 5’7 and 135 lbs. For about 3 years now i’ve been a regular drinker due to the social aspect of university. I would say i drink 2/3 nights of the week, in which i have an average of 5 pints on these days- so about 12-15 units a week on average. I have pretty much never been a guy to drink unless it’s in a social setting, and i have never craved alcohol in my life beyond the friday night excitement to socialise. however, this past month i’ve been dealing with some pretty bad anxiety for the first time in my life. had 4 full blown panic attacks as well as lots of moments of breathlessness- interestingly, my thoughts are fine, it’s just been manifesting in physical symptoms. i’ve been prescribed zoloft by a particularly uninterested doctor but i am yet to start, unsure if ssris are the best option for someone without depression. what i’ve noticed is the big bouts of anxiety seem to come on a day or two after i’ve drunk alcohol. i recently learned about what alcohol withdrawals can do, and didn’t think much of it, believing i wasn’t in the same category of drinker as it could happen to.

however, last night i experienced what i can only describe as moderate withdrawal symptoms. i had been feeling anxious and not right since sunday morning (consumed roughly 10 units friday and saturday, none before that in the week), but last night (monday night) i experienced many classic symptoms of withdrawals, keeping me awake all of the night. this was sweating, breathlessness, nausea, bouts of tremors, even mild audio disturbances. at no point did i crave an alcoholic drink during this, but it was absolutely horrible, the worst night of my life without a doubt. i feel better now (the next morning after getting 3 hours sleep) but still have a stomach ache and a horrible anxiety feeling.

what i’m wanting to know is is this type of reaction feasibly possible for the type of drinker i am. i was scrolling reddit all night, pretty much read every story of alcohol withdrawal and could not find a story of someone who’d gone through symptoms this bad with my level of alcohol ingestion. i am aware of a phenomenon called health anxiety which can make your body imagine the symptoms you think you have- i was so sure this was what it was at first but the symptoms became so pronounced that i’m struggling to believe my body could do that. i am going to go to my doctor tomorrow, but i’m terrified they’re going to brand me as some sort of alcoholic when in reality everything i’ve seen puts me nowhere near that threshold.

idk man this has really knocked me back and some guidance/help/reassurance would be so appreciated. i’m going to quit drinking for now anyway, but due to being so young and being surrounded by alcohol in almost every social setting, i’m worried that i’ll not be able to drink again without exacerbating these symptoms.

TL: DR: 21 y/o male, 12-15 units of alcohol a week for about 3 years, recently started experiencing anxiety after drinking and last night experienced full blown withdrawals. i am so unsure if it’s even possible for me to get the withdrawals i experienced with the amount i drink, and am wondering if anxiety is playing a role. need some perspective and guidance!