"I take as much as I can get I don't take any regret I close my eyes to conjure up something but it's just a faint taste in my mouth"
Basically what I intepret she is saying is, she drinks as much as she can without regret of getting really drunk to make her memory of her ex fade away. The faint taste in her mouth has double meaning - the faint taste of alcohol and the faint taste in her mouth which is used as an expression to describe a faded memory.
"I think I'm coming down I think I'm coming down. By tomorrow I'll be leaving. By tomorrow I'll gone."
When she starts to come down from her drunkeness or high she starts remembering the pain again and she just wants to move on, she knows she can't pine for him any longer, but she wants to hear if he has anything to say.
"If you want to tell me something.You had better make it strong"
Also a double entendre - Whatever it is he has to say, she is telling him he needs to be upfront about it now or never. She wants to be prepared to hear what he has to say by drinking heavily to numb the pain.
"'Cause I think I'm coming down. I think I'm coming down. I think I'm coming down. I think I'm coming down. I think I'm coming down
(Here I go)
I think I'm coming down
(Here I go)
I think I'm coming down
(Here I go)
I think I'm coming down
Here I go
There I go"
She's sobering up from being drunk or high. Depression starts to sink back in. Also, when you are coming down from certain drugs you feel sad or get anxiety which could also be what she means.
"You abuse the ones who love you. You abuse the ones who won't. If you ever had a real heart. I don't think you'd know where to start"
He's obviously hurt her and taken her love for him for granted. He doesn't have any real emotional attachment to anyone though he pretends to. She sees through this though and knows he will never really care because he is a fucked up person. Hence the last line.
"I take as much as I can get I don't take any regret I close my eyes to conjure up something but it's just a faint taste in my mouth"
"I think I'm coming down I think I'm coming down. By tomorrow I'll be leaving. By tomorrow I'll gone."
"If you want to tell me something.You had better make it strong"
"'Cause I think I'm coming down. I think I'm coming down. I think I'm coming down. I think I'm coming down. I think I'm coming down (Here I go) I think I'm coming down (Here I go) I think I'm coming down (Here I go) I think I'm coming down Here I go
There I go"
"You abuse the ones who love you. You abuse the ones who won't. If you ever had a real heart. I don't think you'd know where to start"