You have a sponsor, so I'm presuming you have, or are, working the 12-steps. I would say that (although I'm AA rather than alanon), when I don't work the principles of those steps into my daily life (every day) then fear, insecurity and self-doubt are never going to be far away. 12-steps is 12-steps, so I'm presuming that in al-anon just as in AA, if we want to stay in a state of serene recovery every day , we have to do the work every day. And I know (to my cost) how easy it is for the little things to slip, and gradually stop happening regularly. Is there something you need to get back into your daily routine so that those principles are foremost in your mind as you go through your day? I have a list of them, so if I start feeling a bit rattled I can go through my list and check for what I might have missed out or need to do again.
Hope you feel better soon.