Sorry to hear about this. Amantadine is meant to work alongside your L-dopa to improve your symptoms including dyskinesia. I’ve read that effects supposedly wear off after a few months. But four weeks does not sound right. But the getting hot sounds very familiar – my partner has suffered from “boiling up” when waiting for the meds to kick in and this seemed to start with Amantadine, which my partner has been taking for years. The dosage was reduced because of this boiling up, and bad nightmares were attributed to taking it too late in the day. There was some improvement though it didn’t totally fix either problem. However, stopping Amantadine has proved difficult. Even reducing the dosage steadily has not made it possible to stop taking it. It is hard to say exactly what the drug is doing for my partner, but without it, the symptoms are far worse, in fact, very bad.
Looking on the bright side, it is an antiviral that was developed to fight a form of Coronavirus, if not Covid-19. I live in hope!
Any pseudo medical advice included in this reply is purely my ill-informed opinion from drawing the wrong conclusions from experience. I am not a doctor. I hope things get better for you both, and fast.