Bug in my ear -probably spider- for the last 3 weeks

I have this little problem. Somehow, a BUG got into my right ear three weeks ago.

And I am now desperate!

At first I thought it was a small variety of fly, but flies only live a few days. When this lived a week, I knew what it wasn't. The way it crawled around felt distinctly spider-like. I'm pretty sure that's what it is. Crawly and disgusting. I haven't been bitten, to my knowledge, despite so many attacks on it, and I don't have any pain worth mentioning.

All right. So some vegetable oil will suffocate it, right?

Not.

After two weeks, I saw the doc. He put in oil, too. No cigar. He used a device to squirt water and suction it out vigorously. Nice, but no cigar.

I went home. During the next week, I used oil five times. He must have made a web as a hidey-hole, where the oil wouldn't penetrate and he'd have a nice air pocket. As soon as the oil was gone, he went back to his "work" up high in the ear cavity. I think he was making a web, perhaps laying eggs, too.

FIVE times.

So I broke down and tried using Raid. I worried about toxic effects, but by that time I didn't care. Over the next four days, I put Raid into my ear. It DID have a debilitating effect each time, but within another 12-18 hours, he was moving again. He wasn't doing his "work" as he did with the oil, but he WAS still alive and able to move. Worse, because after a few more hours after he started moving again, he got more active. Somehow, he was RECOVERING from the Raid! The Raid has given me a nasty headache.

I've never heard of such a thing. I seem to have an IMMORTAL spider in my ear. Now, going on three weeks of rather excessively intimate contact, I'm going NUTS!

The bug isn't small, but not huge, either - possibly with a body the size of a fly.

Can anybody offer some suggestions before I spend another bundle to have my doctor try to remove it again? Any ideas what KIND of spider it might be? I live in Mexico, near Guadalajara. The tropics, of course, are excessively buggy. HOW could any bug survive what I've done, and even recover from an insecticide???

Feeling that thing crawling around in my ear is nauseating, to say the least. Please help if you can!