Flashers and floaters and diabetes -- should I be worried?

[Chypre]

I am 61 and type 2 diabetic.  I am having lucentis injections for diabetic retinopathy and they are working very well.  I get a new injection in a few days(the last one has just about has worn off).  I just finished taking Bactrim DS for a UTI.  I had  a lot of side effects including blurred vision and headaches.  "Visual disturbances" and headaches were listed as side effects in the patient information.  The other night I had an explosion of white flashers in my right eye, then in my left eye.  They lasted a few minutes. This was followed by some floaters that looked like black threads.  The flashers are now in the outer corners of my eyes and only when I move my head horizontally.  I can bring them on by moving my head and make them go away by holding my head still.  I only see them in the dark.  The floaters are just about gone.  Is this something to worry about?  Is it caused by the Bactrim?  Are these migraines?  I used to get migraines with aura all the time.  Maybe I'm silly to post this question as I'm going to the doctor in a few days but I'm worried now! !  Any help appreciated.

[Timothy D McGarity, M.D.]

This is probably related to a Posterior Vitreous Detachment. You need to speak with your retina specialist about these symptoms today or tomorrow. Don't wait.

Best wishes,
Timothy D. McGarity, M.D.

[Chypre]

I need to clarify:  the flashers no longer occur in my entire visual field, just in the outer corners of my eyes.