Solution of taking shots

Is there a way i can make taking shots easier? I have been having issues lately with taking shots and it fucking up my stomach. It will give me very bad acid reflux and make me sick for days. I usually drink vodka or whiskey, only had 2 shots whiskey and a couple ipas last night i feel fine.

But the past month i have just doing pure shots of vodka with chaser and i felt horrible. Should i start mixing it into the chaser or is there some trick i dont knkw about?