why since ive stopped smoking 7 days ago i keep burping all the time and my mouth always taste bitter ?

and it seems that i have bad breath now is this common ?

You are getting the nicotine out of your system. Stick to it. Smoking is so bad for you in so many ways.

It tastes BAD when I burp?

Today i woke up and had a propel cause i was very thirsty. Then I started burping. It’s more like a weird breath than a burp, but I call it a burp. Anyways when I do this burp, it tastes VERY bad. I did it once and nearly puked. How do I get this to go away? What is it called?
is this possilbe with a normal tooth brush?

There are a couple of possible reasons. The most obvious is that you have eaten something that is coming up from the stomach. This is most unlikely because very few of us will bring something from the stomach to our mouth where our taste buds are located. The second is a stomach gas that comes from the stomach which can come back up to the mouth.
The most reasonable explanation is just within the mouth. Most bad breath is caused by bacteria on the surface of the tongue, especially in the back of the tongue. This bacteria produces the bad smelling stuff. So it is most likely that when you “burp” you are moving some of the bacterial stuff to a new place on your tongue and now you can taste and smell your own bad breath. You can see this bacteria on the your tongue as “white stuff”, especially in the back of the tongue.
This must be removed to control bad breath and you should be cleaning your tongue to eliminate this bad taste. Go on line and get an OraBrush tongue cleaner and clean your tongue twice a day. You will not have bad breath and I believe it will also cure your problem