Thanks for using Healthcare for your queries
I read your concern and it seems that diarrhoea
is due to antibiotic overdose and there is nothing to worry of headache and shortness of breath
I suggest you to to rest and medicaations to releive headache .. A simple NSAIDs / Ibuprofen
will help in getting headache off and drink plenty of oral fluids and do breathing exercise
to make breathing regular.
Avoid stress and use of caffineBed rest
and fliuds will cure your symptoms and you will be back to normal .
You can ask me furthur if you have anymore queries
Dr.J.Kingson John David