Post 3 level cervical fusion recovery. Is mild confusion normal?

Hello, I hope to hear from others who are recovering or have recovered from spine surgery. I am hoping this is temporary. I feel mentally exhausted and confused, I’m feeling like I’m in a total fog! I read the news articles and magazines and don’t retain what I’ve read. I leave tasks unfinished. I’m afraid if it doesn’t clear up I won’t be able to return to my part time job which I enjoy. Is this typical? I had a 3 level cervical discectomy anterior fusion, C4-C7, 4 weeks ago. I’m healing well, wearing a collar for six weeks. I had a TIA the end of January this year, so I guess I’m concerned more than I should be. Thank you for any help!