Re: SEEKING HELP, please.

It sounds like a nightmare to get yourself diagnosed with the doctors. I have been through similar things, they never diagnosed me. I made the diagnosis myself and self treating.
I think the event that you swallowed something and you have/had a swelling in your throat might be important. Where have you been? 2 things are important: do you have a subcutanous parasite (mite, larvae, something from a fly?) that moves close under your skin or you have something that disseminated via entering you skin and then into your blood stream? It certainly sounds like something disseminated in your body. Many parasites enter via skin. The site of penetration becomes irritated or itchy. You might see red lines. Or something moving under skin?
You could have both, blood parasites and subcutaneous. You need to research a bit on this, like what could enter via your skin(or in this case you swallowed maybe an intermediate host?) the larvae then swelled up and then made its way further and now spreading out. Then compare your symptoms. Many insects are intermediate hosts, meaning they can contain infective larvae. It could be this was just an additional trigger and you already had parasites that just disseminated now.
Try reese's pinworm medicine see if you pass anything in stool. That can also be a clue.