Possible PI-IBS is this permanent?

Hi all, I’m about a week post fidamoxicin and I saw GI today because my stomach still hurts and my stool is inconsistent (varies from loose to pellets) and varies in colors. I can’t eat anything other than bland foods without feeling nauseous or having stomach pain. The GI doctor told me to Take Metamucil once a day and try IBgaurd. I did the dreaded google search and now I’m petrified I won’t ever be able to eat normally again, I desperately miss eating the same meals as my loved ones. Has anyone else dealt with this and what was your outcome?