I have heard the inside story on fast forwarding patients into treatment like yourself and the back lash can be the patient is left reeling with a ton of mental adjustment to manage and needs to be kept an eye on. Well done so far, you seem to be doing great. Hang in there but don't be afraid to call on your McGrath breast nurse or anyone in the oncology area ( social workers etc) who can be a sympathetic ear and a bit of a hand if it gets a bit to much.
You dizziness could be from low blood pressure. I naturally have low pressure all the time and am used to being a little light headed occasionally but if that's never you, you should ask your Dr to check it for you.