The class of SSRIs and SNRIs can cause this. Some opiates also, affect serotonin.

If you take NO other drugs, and still show this side effect which is called Akathisia.... check and see if you have had a chest Xray recently. Some hidden tumors (cancer) secrete large amounts of biogenic amines, which serotonin is one of.

Some lung cancers and others called carcinoids, secrete serotonin
which causes akathisia, (uncontrolled movements of the muscles) like your stomping, or pacing or an inability to stay still. These tumors don't show up right away, and may only show with the presence of serotonin in the body.

So a chest Xray and/or blood work for serotonin may show something.

I had a thought. Maybe this foot stomping urge has something to do with the same process that causes jerking leg syndrome when your in bed at night. Try some of the treatments for that and see what happens.

I know that if I get that jerking feeling in my legs if I take some magnesium and potassium for a few days it goes away. Also since I started taking MSM for my bad knee I haven't had it.

Just a thought.

I'm going to post a link to a video my wife made this past Nov to better explain what I mean by 'foot stomping' - VID 20171130 212432 - YouTube