I used to not have any problems with my contact lenses, which I have been wearing for a little under a year. But I switched solutions very briefly, then switched back and now my eyes get very badly bloodshot every time I wear them. I switched everything out and stopped wearing them for a couple of months, and even spent a period of time using steroid drops from my eye doctor. No dice. Still red eyes every time. What could be causing this and what can I do about it?