If you have been light head and nausea to my stomach for two days could it be that you have round worms?

There are any number of reasons for it.

No contributor to this site can diagnose illnesses, diseases or pregnancy over the internet, nor is it the purpose of this site for them to do so. The best that can be offered is general advice which can never be personal to any asker. If you are truly worried about your condition then you must seek local medical attention.