Severe leg pain at night after stent.

Hi . My father had undergone non emergency - precautionary angioplasty stent procedure 5 months back. It was during a normal health checkup, our doctor adviced for angiography as a precaution without any heart attack or any chest issues , he was advised for 1 sent as a precaution . I am attaching the photoes of before stent After 2 months of stent , my father suffered from severe allergic reaction called anaphylaxis , the reason is still unknown . Since the time of stent placement, he is suffering from severe leg pain at night but we are worried to give any new medicine due to anaphylaxis and we are not sure why this is happening. He also got one cyst at the back which is having pain and surgeon is suggesting to remove this through surgery but our heart doctor is not recommending. Can you please suggest about leg pain and surgery.