Coming off Tamoxifen

I came off Tamoxifen on the 13th May after 10 years, I do feel slightly anxious coming off it even though I did have some side effects whilst taking it. I'm wondering if anyone has experienced any bad side effects when they came off Tamoxifen - what they are and how long they lasted.

I've read on some forums, mainly English ones, that some people experience quite bad tiredness and fatigue and what they describe as 'brain fog'. I have noticed that I'm feeling quite tired the last few days but, having only finished taking Tamoxifen on Saturday, I don't know if I would be feeling the effects this quickly.

Has anyone else experienced this?