Late onset fatigue / dizziness

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Hi everyone I guess I’m looking for some positive comments / experiences. 
I had Her 2 positive breast cancer er diagnosed September 2024 . It was treated with chemo and then left sided mastectomy ( April 2025) then radiotherapy in July 2025 then finally phesgo injections which ended in November 2025. 
in the last two weeks I’ve been hit by a tremendous huge wave of tiredness around 5.30 each day meaning I need to go to bed and rest for the evening . I also feel slightly unsteady and wobbly around escalators and if I put my head down when sitting down the world tilts from side to side . I also sometimes feel a bit sick . 
could any of this be late on set side effect of radiotherapy or chemo ? It Wouid be very late onset indeed if it were but I’m wondering if anyone else felt fine after treatment and surgery and got blindsided with fatigue and dizziness later ?