Okay so about your dentist and doctor ask them what they plan on doing during your appt. that way you know what's going to happen. When your at the dentist close your eyes and try to relax and don't focus on the pain.
Bad things can happen anytime or anywhere, but we are only human and we can't predict what's going to happen in the future. Everything happens for a reason even the bad things. Staying cooped up inside isn't doing anything for you. You are gradually making yourself more afraid.
For Example: your taking yoga and stretching different muscles in your leg. You go continuously for weeks and began making your splits. One day you catch your friend's cold. You start by missing one class, than two, than three and so on. Your muscles in your leg start losing its flexibility and you can know longer touch your toes.
In case you don't get this example I'll explain it. You were taking your meds and you were doing just fine. You stopped taking the medication for necessary reasons. By avoiding your fears your letting them become greater and now all the progress you made with your meds is lost, but that's okay because you can get it all back.