This is pretty weird. I am wondering what might cause your problems.
By theory, nausea caused by medical conditions would not be expected to occur at specific times. If it does occur, it is mostly attributed to psychological issues.
If I understand it correctly that you actually mean you just got nausea and vomiting these 2 weeks, then many medical conditions would have caused it and you need tests. For instance, it could be caused by a stomach tumor that blocks the passage of foods. Certainly, there are always other possibilities. It could only be determined by tests. You may consider seeing a gastroenterologist.