Help!!

Ok so almost 3 months ago I went to lay down for the night and got this horrible sharp pain on my left side, felt like my rib getting caught up in my lung, it lasted for about 5 minutes. Ever since then I've had this persistent pain in the area and also the left of my belly button and just basically random pains in that whole area. I've been to 2 drs and they diagnosed me with costochondritis. I just dont know if this is what I really have or not but its taking over my life and I just dont know what to do. All I want to do is lay in bed with a heating pad :( I'm wondering if there is anyone out there with something similiar and what it ended up being and how did you get over it. I want my life back so bad :(