Does it sound like I might have a blood clot? please read, I'm freaking out!?

Well yesterday morning I woke up at about 6 and I had this excrutiating pain under my left breast in the top of my ribs. I thought it was just gas but the pain hurt sooo bad and felt like it was going up by my heart and my shoulder. I was also extremely and oddly gassy the whole day yesterday. The ER told me that it sounded like I could have possibly had a blood clot or inflammation. They gave me an EKG which was normal, then said they wanted to check my blood for a blood clot and I freaked out and refused cause I'm scared of bad news AND the pain went away. Since the pain went away and I was extremely gassy (and still are for some reason) do you think the pain was linked to gas? Does it sound like the pain was due to a blood clot?? I'm also 21.