About 10 yrs ago I had a right branch vein retinal occulsion.

Occlusions are typically what affect the retina and can cause
fluid to accumulate there.

Here is an article about them:
http://www.focusonretina.com/occlusns.htm

No cause was ever found for mine. I had angiograms and no cause was found. I had alot of pain in that eye and headache, and loss of night vision, but not day vision.
I have not had any other events since then.

I find this explanation about your contacts odd... But leaving contacts in too long will cause the cornea to swell, since it is deprived of oxygen.

Many years ago I wore hard contacts. When my PCOS started to become severe, I started to have swollen corneas, and had to discontinue them. I was told that birth control drugs, pregnancy or other hormone problems that cause fluid retention in the body, may make this happen. Haven't worn contacts since. They were just too much trouble, and I couldn't risk having corneal damage result.