You have been on warfarin
for DVT. You have to reduce the dose of warfarin to keep the INR in the range of 2.5 to 3. Yes brusiing on your skin is due to high INR.
Regarding your gland enlargement and fever you may be suffering from lymphoma
. Please check with a competent physician or consult a Medical oncologist
.possibly you need to have biopsy
from the node after the infection is ruled out.