To be clear, floaters due to posterior vitreous detachment do not usually cause frequent headaches or strained eyes.
I would encourage you to have your eyes checked by an ophthalmologist to rule out other eye diseases.
With regards to treatment for floaters, most of my colleagues and I would usually adopt a conservative approach to managing floaters (ie just observe). In some cases where the floaters are large and persistent, some surgeons may offer patients the option of laser or even vitrectomy though these surgical options do carry its own set of potential risks which may not outweigh the benefits of reducing the symptoms of floaters.
More importantly, with respect to new symptoms of floaters, it is recommended to have an eye exam to rule out associated serious conditions such as retinal tears and/or retinal detachment.
Bottomline in your case is to seek the attention of an ophthalmologist to find out what exactly is the roots of your problems.
