Hi,
The first symptom you mention is most likely to be a dry eye issue which can present with foreign body or grittiness, sometimes along with watering, burning or stinging eyes. People often complain of intermittent blurring more often with concentrating tasks which clears on blinking.
The net curtain and floaters which you are experiencing are most likely to be a posterior vitreous detachment (PVD)as said previously but I hope this has been investigated fully to exclude retinal detachment or retinal tears. Your practitioner should have dilated your pupils with eye drops to look for signs of retinal trauma. if this was not done seek a second opinion ASAP.
These links are pretty useful.
http://www.patient.co.uk/health/Dry-Eyes.htm
http://www.goodhope.o...ments/eyedept/pvd.htm