Talk to Psychiatry on Adult ADD And Social Anxiety Disorder

I have always had problems with focusing, being on time, organised, etc but since a couple of years, it has become much worse. I am not doing well in exams (although I'm quite intelligent), missing important deadlines, etc and I feel impaired. I have taken multiple quizzes online and they all suggest that I do have ADD. I have also had social anxiety (perhaps general anxiety as well) since childhood and it's affecting work, sleep, etc. 1. Is medication effective? 2. Is it safe? 3. Can these issues be addressed with one medicine or would I have to take multiple?