Chemo brain?

Hi there - I finished my treatment for breast cancer in June - and now I’ve gone back to work - they’ve been very supportive but I am so very very tired all of the time - also I’ve noticed I’m not so quick to make decisions as I need to be in my job - I can’t find the words I need and I find myself searching my brain to work out what to do next - is this normal? It feels anything but normal to me and as I have a very demanding full on job with mega responsibilities im finding I’m not reacting as I should- it’s almost as though I can’t react / make the right decision and I need to be instinctive in my job as I’m responsible for others- does this make sense to anyone out there? Im beginning to get very worried that something else is going on with me - take care all you lovely people - let me know if you’ve had the same and will it pass? Thanks