could this be cancer?

I am wondering if somone could give me some ideas on what I might have. So here is the story on how this came to be. On my down my stiars, I grabed the ledge at the top to swing down, when i did that, I felt some sort of tare or ripping sensation rigth by my right brest muscle(slash)ribs. The next day I was in extream pain on y rigth upper quadrant of my chest. Just above the niple. This pain radiated down to to my last rib. A few months went by and I still had pain. So I went to the walk in clinic. X-ray was done, they couldn't see anything so they said it could be pulled chest muscle.

Now the pain was on my right chest, and it feels like is inbetween my ribs, and the muscle right under my armpit.

So another 6 months go by, and I am still in pain. I go back to the walk in, and another x-ray done, and still don't see anything in my lungs atleast from the x-ray. Now I also have a pain in my back on the right side, feels like a knot, it's the same location on my back as where the pain is on my front right side. I also have pain going up my rigth side of my neck and my right side of my jaw. Now this is concerning me. I "was" a smoker. Since the pain wasn't going away, and I started to google and scare myself, I quit smoking. After i quit smoking for about a week, I noticed that the pain in my musce rigth by my arm pit is gone, jaw dull pain is almost gone. Neck dull pain is almost gone.

Now I just have a dull pain where my nipple is on the right side, and sometimes goes down to my last rib and dull pain what seems to be inbetween my ribs. So, this is better, atleast I know smoking was aggrevating something and causeing more pain then I needed to be in.

Now I still don't know what cuasing the dull sensation on my right side and my ribs still feel tender. I had a few smokes with some beers one night while I was out with the guys, and all the symptoms come back, the mucle under my armpit hurts, jaw and neck hurt on rigth side. almost feels like stuff is inflamed, but anti-imflamatorys don't do jack squat. Needless to say, that was interesting to confirm that smoking was causing the extra pain. The weired part is I can't tell if it's a muscle, inside my lung, or somewhere inbetween. So here is what I am thinking. When i did the swing thing down the stairs, I tore something really bad, not sure what, but something. It's also weired. if i excersize the pain goes away for a bit.

Based upon what I have just described above, can anyone offer a suggestion to what may be going on. I did alot of googleing and couldn't find anyone with my symptoms and I just ended up scareing myself probably more then I need to be.  

could this be first signs of cancer?

I am having a hard time getting in contact with my doctor at this time, but i do plan to go if I ever get an apt.