I experienced headaches, blurred vision, nausea and vomiting. Should I be worried?

Yes this is concerning. If you were my patient I would do a full work up for headaches/vision changes (ex, are you also taking antibiotics, do you suffer from migraines, are you obese), and stop the medication for several days and see if you get better.  

I cannot tell you for sure if the issues you describe are coming from your medication, but if ANYTHING like you describe occurs after starting ANY new medication, you should stop immediately and call your physician for guidance.In many cases, it could be something completely different -- you can get the flu and break your leg at the same time.  Please call your physician for follow up to this problem.

Contact your prescribing doctor. We want you to be safe and these  things that you are experiencing could possibly related to the drug. Discontinue the drug and get in to see the doctor who will exam you. If you cant see the doctor for any reason, it would be prudent to be seen in an emergency room Please take care,Beverly A. Johnson MD