I too suffer/suffered (not sure if they're totally gone) with Ascaris. I haven't seen them in the toilet since Humaworm but one can never be too sure, since those blasted buggers are persistent.
I don't trust doctors; I wouldn't go to them unless I really had to. A blood test, in my eyes, will just show how the body is currently operating but it doesn't mean that it will ever tell you the cause of the symptoms you're facing.
It was funny 'cause the ophthalmologist I visited that time asked me, "Are you healthy?" I wanted to laugh out loud. Healthy? I'm suffering from candida, I have leaky gut, my bowels aren't moving consistently, I have parasites, my liver/kidneys are stressed AND I came to you 'cause of my eyes... and you're asking me if I'm healthy? Would a healthy person visit a doctor. C'mon now, doc.
People have recommended me the Dr. Christopher Eyebright Eye Wash. I wanted to buy it, but I wasn't sure if it would eradicate the parasites in my eye. Still, its on my list of options.