What Could Pressure In Chest And Swelling In Tongue Indicate?

I have a DVT factor 8, had this condition for 11 years. I have had pressure in my chest. I have a greenfeather filter. Today I went to the emergency room. They did test and stated after testing INR result was 0.97 low. No clots. They upped my coumadin after being on only 2.5 to 5.0. That was Wednesday. MY INR has not raised, I am worried about why it has not raised. I was sent home told to contact my doctor on Monday. Nothing was given to me to raise it. They did cat scan and testing and found nothing including a blood clot. I have been on 2.5 Mg. for a year. I have not had my INR checked until two weeks ago because the doctor I use to have said it was ok for six months to not have it checked. My new primary said that was not correct. Two week s ago I had a blood clot that the filter did catch. Was taken to Freeman Hospital where they did test, and even a echo of my heart, while doing a stress test. They said it was heart burn!!!! My primary said that was ridiculous that it sounded like I had passed a clot that the filter did catch. Never had this close of a call. Today the right side of my tongue swelled for no reason. The emergency doctor said it (the tongue swelling) was probably something due to an allergic reaction. I am not allergic to anything!!! They found nothing sent me home saying to talk to my primary. I am 42 years of age female never smoked, been in great health. Now these items are coming up. I am scared these doctors are not finding what is wrong even with my condition. Why would my right side of my tongue swell during this?