A blood clot in the arm would normally not cause such problems.
node enlargement might be due to some other reason and the fact that it has been removed and will be examined under the microscope tells us that there is a good chance of finding out what is the cause of the lymph node enlargement.
If there is tingling
and weakness of your left side then you might want to tell this to the Physician who is taking care of you. He/she might suggest brain scans to rule out blood clots