This is Dr. David
I am sorry you are still grieving for the loss of your husband.
you can try over the counter stomach acid reducing medications like zantac (ranitidine) 150mg in the morning and prilosec (omeprazole) 20mg before dinner to help decrease stomach acid which could help your stomach nausea
also make sure to eat regular meals. empty stomach can cause worse stomach acid and nausea
have you been missing meals?