I think it's a good idea to tell family members whom you trust. Perhaps they won't be worried. After all, it's not a life-threatening illness. People with other physical and mental illnesses tell their families. Why should we act any differently? It's very kind of you to think of other's feelings. However, we cannot control other's reactions. SA causes us to focus too much on other people's feelings and reactions. Please don't let ANTs (Automatic Negative Thoughts) stop you from telling family.
I told some of my family, and they don't worry about me. I've also spoken to, at least, 15 other people who've told their families. My family will never fully understand what I'm experiencing; but, at least I have some support and I feel less shameful about having SA.
As for medication, I took clonazepam in order to function at work. It was a last resort, but I'm glad that it helped. I've never tried beta blockers, but many people with SA use it. You don't have to stay on medicine forever; but, It will probably help you to function better at your job. As you learn the coping strategies in Dr. Richard's program or elsewhere, you'll become less dependant on medication.
BTW, the tiredness is most likely mental (nervous) fatigue. I experience it, as well. If you can force yourself to exercise (preferably cardio) for 20-30 minutes, after work, you will probably gain energy and feel less anxious. It works for me.