Back pain: terrible front pectorial and rib pain

Hi im new here but im in need of help really bad.. Im depressed and so upset i don't know what to do...
Im a 24 yr old Male im 185 / 5.11 I had my gallbladder removed 7-8 Months ago. I can eat anything rly nothing different. i wasn't rly experiencing bad attacks before it was removed but the surgeon said it was infected bla bla bla... so i got it done...
I felt great 1 month after... then all the sudden a big onset of back pain came... now for 6 months Ive had this back pain in my upper right shoulder area and goes down and around to the ribs. I cant stand it anymore i keep thinking its lung cancer or something crazy im a worried person in general and this makes it worse. I smoke yes for 8 yrs im planning on quitting before my 25 birthday but Really i don't wanna live anymore i was talking to my girlfriend about this pain and i cant do anything if i go to work . ( im a waiter at a fine dining ) well i can go but i have to hurry home and put a heating pad on my back cause it hurts so bad.. I haven't taken any more medicine cause i don't wanna ruin my liver.. Ive been back to the Doc who did the surgery and told him Ive been to my regular doc and told her too ive been to a physical therapist they all say its muscle spasms and the surgeon didn't say anything he did a chest xray and said everything was fine. ive been back to my Regular doc 5 times for the back pain and they just say muscle spasms, Anxiety. blah blah blah Ive had anxiety before this isn't it.. this pain does not go away unless laying down with heat on it. even then i can still feel it a little bit but at soon as i walk around i feel it again. It goes numb sometimes it also gets hot and cold.. and just terrible throbbing pain. Im at the end of my rope here with this. I don't know what to do. im suppose to goto a back specialist in a week but rly what is he gonna say? I cant stand this and i cant seem to lose weight either i use to be a constant 160 now im up 25 pounds and it is stable. I eat semi healthy i do have my cookies every now and then and ice cream but besides that i eat veggies fruit and lean meat. i try to stay away from red meat. but this sux and i rly am lost! SOMEONE HELP ME PLEASE Sad((( Also the front ribs will rly hurt some times and it makes my face just go sad sometimes it happens at work and ppl are whats wrong with u.. I just look down and wanna cry but don't but still i want to. i hate this..