The period symptoms could be because of the high hormone dose that's in the morning after pill, antibiotics should affect your period that will be more to do with the emergency contraception.
it won’t let me attach a photo but i found smth similar looking to my problem online:
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That's fine don't worry just reply when you can. Vaginitis and thrush are both a kind of yeast infection one being more internal and one more external what I think you have, if you go to your local pharmacy and ask the pharmacist then they should be able to help you with an over the counter treatment normally a cortisone cream to apply that should reduce the infection.
The only way you can send pics on here is to upload them to a file share or storage site like Dropbox then post a link to the file like that but I'm sure you wouldn't want everyone to see your vulva so it would need to be done through private message (members only) so it's up to you but would be more help to actually see and compare to what that site shows.
Hope this is helpful