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There are many possible causes of these symptoms. Certainly, a vascular problem could be the cause of such symptoms. There also could be an adverse effect of the drug on blood pressure or vascular disease and contribute to the symptoms. It also could be related to musculoskeletal inflammation, which could be pressing on the nerves and causing these symptoms. There also are certain neurologic conditions that can cause these symptoms.
Of course, anyone with EKG changes for which follow-up is recommended should undergo the appropriate cardiac evaluation, even if these other symptoms are not present.
If you were to stop the drug use and the symptom resolve, that would be a good sign.
If I can provide any further information, please let me know.