I have DVT of the Upper extremity (left arm). Sub clavian brachial and auxiliary veins thrombosis. Initial symptoms were swelling, reddening of the left arm with pain in shoulder originating from the lower neck JAK mutation test came as negative CBC= 16.2|7720|3.01 Was treated with clexane 60 mg for 10 days and ever since taking eliquis 5 mg tablets twice a day since 3 months. Everything seems to be fine All of a sudden the arm started reddening again along with pricking feeling near the clot area So visited the doc again and repeated a Doppler which advised no improvement in the thrombosis area Visited a physician for second opinion today - he asked to repeat all the tests and do a lot of blood tests What is the right course of action What kind of a doctor should I visit and what are the risks and complications.