How do I stop feeling like im about to drop dead any moment

I’m 20 m and I’m in my second year of university and I think I’ve developed a bit of a drinking problem . I can manage my work suprisingly, that’s not the problem but I think my drinking is seriously affecting the state of my mind. It started off with me drinking a glass of whiskey before bed while watching something on my laptop, one drink turned into two and then eventually I started drinking a small glass of whiskey before class just to take the edge off. This coupled with the fact that my nicotine addiction has gotten out of control and I’m smoking half a pack a day is kind of worrying me but I can’t stop.

Maybe it’s the crowd I surround myself with because they’re all drinkers too but they’re amazing friends and I don’t want to alienate them. I had a week off from uni recently and every night I partied and was basically on a week long bender and at the end my body basically gave out and I still fucking drank the next day because I just love it.

The thing is my drinking now is really affecting the way I think and feel. I constantly think I’m about to drop dead any second or die in my sleep, my anxiety has gone through the roof and I just want to fucking burst into tears at random moments, I legitimately I have no idea what’s happening to me but I love drinking so much that I just don’t care anymore.

I just want to stop feeling like I’m about to get a panic or heart attack