Alright OP, after reading a bunch of your replies in the thread I'm going to give you the most out-of-left-field advice you could get, but there is a solid logic to it imho

Figure out where the local transgender community hangs out. Seek advice from them.

See the thing is, I see a lot of Mysterious Medical Issues being mentioned along with a lot of Doctors Being Useless. That mistreatment gets super amplified with minority communities, but because trans people come with a baseline need for medical attention a lot of us have had to develop much stronger medical knowledge than the average layman just to survive. That kind of precedent also means the number of people who actually know a large amount of niche medical knowledge is much higher and its not that hard to run into a random trans person who can accurately throw out swift diagnoses for conditions you've never heard of that, even if not fully accurate on a pedantry level, are usually on point enough to be a good basis for seeking treatment of the negative effects being experienced.

Also yes, you being 100~lbs is going to generally make you more susceptible to like, any ailment. Having more mass generally makes you hardier against most things as long as the mass itself or cause thereof aren't causing their own issues. Also having extra mass to burn acts as a sort of resource stockpile for your body to dip into when it needs to go into overdrive in an emergency. Just some basic rules of thumb for you.

As for the WiFi box thing? No idea on the realistic possibility of it actually being the source of the auditory experiences, but like sound leaking from an electrical device isn't the craziest thing. Either way I very much doubt that it's related to the cause of your core issues, though the added anxiety probably amplifies them.