"No continuity "

In the last month, both my wife and I have experienced problems obtaining medication. We separately had on the day appointments for new but different conditions. We were given medication, just enough for 28 days, but not told what to do after that time. The medication was not added to our repeat prescriptions. I now find myself out of medication when the leaflet with it states that it may not be effective until 6 weeks and not to stop it until instructed to by a doctor. I have tried to get an appointment to ask the doctor but nothing available. 111 just tell me that I must see my doctor. I am so worried. What do I do?