Work related!

Sorry not about ttc or pregnancy but I needed to rant and ask other people’s opinions! Right so over a week ago I asked my boss if I was able to take half day on Wednesday 29th because I had a physio examination because of a recent car accident. She agreed I could take the time off and my column was booked out. Then this Friday I called in sick because I had a really bad stomach virus and couldn’t stop being sick!! Instead of a message saying “hope you feel better soon” she said we need to have a meeting about your sickness and you will now be working that Wednesday so you will need to change your appointment. Because she’s left it so last minute and I can’t call the physio until Tuesday because it is bank holiday weekend I will be charged £85!!! To cancel my appointment! I know she only did that because I took the day off! But I am also working the Tuesday which is not a day I’m contracted to.. it’s usually my day off so I’m helping cover!! What should I do?! Do you also think she’s in the wrong and being a right d**k!!