I have never heard of anyone having any of those symptoms, or any adverse effects, as a result of taking either low-dose naltrexone (LDN) or low-dose dextromethorphan. A possible exception might be one member of this forum who thought that a rise in his blood pressure the day after taking low-dose dextromethorphan might have been connected to the drug. His hypertension resolved quickly, and I think he has not tried DM since then.