See an ophthalmologist. New floaters need to be evaluated for the possibility of a retinal tear which can lead to retinal detachment.
Search the forum for flashes and floater.
Dr. O.
Can be something really important /serious - or no.There's no way for you to know by yourself .You better set an appointment with an eye doctor .especially if you feel the thing is getting worse .( Flashes means urgency ) Hope doctors gives you good news.Good luck!