I Am Looking For Friends Who Can Relate To Health Anxiety

Anybody able to reassure me or know much medical wise?. I've been getting calf pain on and off for the past 3 weeks, mildly and behind my knee, the knee itself also. I've been to a&e twice in the space of a week and that has now been 2 weeks since I was last in. First time I went they measured both legs which was normal, did a full blood count, checked u&e on the bloods, and a blood test to check for clotting. Everything normal, also an ekg and chest xray also normal. I was still in pain and couldn't let go of the worry so ended up there a week later. Again EKG was fine, did a blood test which nearly completely rules out a clot and it was normal. So the doctor has tried to assure me it's my asthma that's worsening the coughing and chest tightness. I'm scared I'm going to drop dead any second, anybody have any idea what could ease my worries!?!. I've had to book a counselling session due to my health anxiety, can't cope with it. I apologize, I know this isn't a site for medical advice. I just know I can't keep going back and forth to a&e.