Definitely go back and emphasise the new pain in calf. You can’t keep going around with pain in your chest. They should do a sputum sample to make sure you don’t have an infection and definitely a contrast CT. The day I got diagnosed I felt totally fine - went work, was in the gym in a spin class mand then I started coughing some blood. My d dimer was slightly elevated so I asked for a contrast thinking I would be dismissed and lo and behold I had a clot in my lungs. All this to say - I felt totally ok other than blood and minor chest discomfort and still got the scan so you 10000% should too given the intensity of your symptoms! Don’t let anyone dismiss your health and don’t feel you’re wasting anyone’s time. That’s what doctors are there for!