you suspicion is very reasonable. I believe a proper evaluation should be done and the possibility of a deep vain thrombosis
should be borne in mind. However, doing an X ray
of the led could be reasonable, and markers of inflammation and infection tests could also be run. If a sciatic nerve
pathology is actually suspected, a spinal X ray or CT scan
could be of help to ascertain a definitive diagnosis.
I propose you meet your family care physician or specialist so these options and probably or he would propose, be exploited and a diagnosis decided upon.
Thanks and quick recovery,