From Longman Dictionary of Contemporary Englishbe/feel/look like your old selfbe/feel/look like your old selfBETTER/RECOVEREDto feel or look better again after you have been ill or very unhappy It’s good to see you looking more like your old self again. → old
Examples from the Corpus
be/feel/look like your old self• After five months in the hospital, I'm feeling like my old self again. 