I only have the knowledge which surrounds being a student helper at open days and being at university myself.... but from my experience it is business studies and subjects like critical thinking that universities exclude from being in the "3 A levels achieved in one sitting" that they want... however so long as you did the Polish exam in A2 year, that could count as your 3rd A level (so History, Sociology and Polish).
Also, univeristies are rather lenient if you explain to them about illness or personal circumstances... so just be sure to let them know if you can provide evidence that this actually is the case (evidence is key). And bare in mind, universities want students to go to their university - increases the amount of money they have and the statistics that they can show.
So, although the choices may not aid you application to university, at the same time they are not going to completely impede you from going... you'll just have to choose your topic with regards to what you have studied and the requirements of the specific university. (Not saying that you have to stick to the subjects you have taken at A level though... I took English, History and Physics, then at university I've taken Psychology, and they were completely fine with that since each subject was linked into the personal statement)