I was in a situation very similiar to yours before I quit three weeks ago.
I binged on the weekends and that would sometimes carry over into Monday and felt like hell the beginning of the week.
I drank vodka and a lot of it.
I was very concerned about withdrawal symptoms but got through with just anxiety issues and a week of crappy sleep.
This is just how it was for me, if your having chest pains that can be serious.
I'd play it safe and do like others have said and see a Dr.
Best of luck!!!