Hi,
Contact lens if maintained well and if proper contact lens solution is used,they don't generally harm your eyes.but chronic use,that is ,more than 5-7 years is associated with some chronic changes in the eye,like presence of a few papillae,dry eyes,etc.chances of developing a intolerance to contact lenses also increases over long-term use.if dust sets in between the lens and the eye,u will definitely have problems as u described.if symptoms persist,consult your ophthalmologist.
Next Steps
opd consultation
Health Tips
don't change brand of contact lens solution frequently
don't wear contacts while sleeping
prefer daily disposable over extended monthly wear