Smoking symptoms help please?

I've been smoking for oh let me say 4-5 months now and I tried every cigarette under the sun. Regular,lights,ultra lights, menthol you name it. It was quite a bit also almost a pack a day. But a few days ago after a cig I had a really tight chest pain and it reallyt scared me. So I am trying to stop. I had like one or two in the last few days and the other night I tried to sleep and felt like I couldn't breath. I was like gasping for air it felt. But now ill I have is a tickle that makes me cough and. Hear and there shortness of breath. I am also over weight and a lil out of shape. Will I be ok? Are they regular symptoms since I've stopped smoking basically?