I have felt unwell for about 8 days - cough, sore throat and sore ears, and blocked sinus. I am a mother of two children, 11 year old boy - also who has had a dry cough for 8 days and is tired and an 8 year old girl with eczema and positive staph cultured recently from a nasal swab. She is otherwise very well and eczema has now cleared with ointments and staph with nasal ointment. My symptoms got worse in the weekend and I felt full of a sinus infection, very tired so I self medicated with a dose of oral doxycyline 100mg , then again one dose in the morning. I feel so much better tonight but only have 2 more tablets left. Is that enough ? I know it is not ideal to self medicate but I have been prescribed this once before for a similar infection and it worked well, also with a steroid nasal spray. Interested in your thoughts.