having issues throwing up during/after drinking

Recently i’ve taken a 3 month break from drinking and have since resumed and have been throwing up fairly severely(emptying my stomach, multiple vomits) on much less than what i would previously drink with no issue. I understand that my tolerance must have decreased over this period, but when drinking I don’t really feel particularly intoxicated when I reach the point where I start throwing up and having my stomach feel super uncomfortable. I want to understand how I can keep myself from throwing up so quickly, as even the smell of a strong drink begins to turn my stomach. I’d like to better understand the physiology behind this and see if I can avoid the stomach discomfort.