I had a haematoma post mastectomy which didn't get big enough to go back to theatre thankfully. My blood pressure came up quickly back to normal but I was dizzy when I got up first time so please take it gently. I had spectacular bruises all over me which spread over the unoperated side so my remaining boob was black and blue which gave me a fright but this is normal. Do take it easy and don't feel a fraud. It is a lot to cope with so be kind to yourself xx NHS staff are brilliant!
Sweet dreams to you too. Hope you get a good night's rest (I know what hospitals are like for noises in the night) and that you'll feel even brighter tomorrow.