Hello and welcome to Healthcare Magic. Thanks for your query.
You have not mentioned what medication your husband took an extra dose of (you have only mentioned "40mg", but have not specified the name of the medication).
However, since you say that he had severe vomiting
following the overdose and that his feet are still swollen, it appears that he is having significant adverse effects due to the overdose. So, I would advise you to seek urgent medical help
. He will need a proper medical evaluation before deciding when or at what dose to re-start the medication.
Wish you all the best.
Dr. Jonas Sundarakumar