Back in march i had a midline put in my right arm for iv antibiotics. April second i had a large round rash on my arm and pain. I had an ultrasound that showed a small brachial vein clot and a complete clot of the basillic vein. At 1 month the clots were gone. I was taken off the blood thinners may 2nd. However i still have arm pain now and then. When it gets bad it will go away instantly and then i have chest pain. I have had 7 ultrasounds since on my arm all negitive. So what is going on?