ive been breathing in the fumes of a broken wire extender […] the fumes were masked by my huge desktop pc, i thought it was just electrical hot air as it only occured when my pc was on (pc was hooked to the extender).

Unless you’ve been around a (bad) garbage incinerator or burn pit inhaling burning plastic, I don’t think this is your problem. Like, some melted plastic isn’t going to do much except stink and maybe give you a headache.

The kind of cognitive decline you describe sounds super fucking bad and I’d consult a doctor as soon as you can get an appointment. For all you know you’ve had a stroke and it’s just been left untreated.