if you are you getting over an infection that can knock you for six as can taking the pill for the first few months,also the emergency pill can make you feel sick and tired.the weather is a bit too much to bear a min so sitting in it all day isnt the best,i would suggest going back to your docs if you feel no better in a fews days.
You have a lot going on. The morning after pill can make you quite sick. Also starting a pill that is not right for you can cause some of the symptoms you are descibing. My advice as a licensed health care provider is another trip to your docotor and celibacy until everything is figured out. Empower yourself....if you feel like something is wrong it probably is, even if it is small and fixable, which it probably is...try not to freak out...just go back to your doc. All will be well.
I'd say dizziness and stomach aches are from taking your birth controll and the morning after pill toghether. The morning after pill is enough to make anyone sick, let alone taking your regular pills with it. And yes, heat, sunburn and temperature changes can all affect the way you feel, and your symptoms do sound alot like too much sun. However.... If you notice you still feel horrible after the sunburn goes away, you should get it checked out. Your infection may not have been totaly cleared, or it could have spread somewhere different.