Recently I Had To Take Sulfamethox/trimethoprim 800/160 For A Problem

Recently I had to take sulfamethox/trimethoprim 800/160 for a problem that 1 primary, 1 neurologist and 2 dermatologists cannot fiqure out what I have. This with Muprocin ointment is her first action to determine what my skin/bug problem is. TWO YRS AGO THIS STARTED! My son and I first got it when taking down my bluebird houses and feeders...We then looked into this big bathroom mirror and could not understand what we were seeing...Our eyebrows and eyelashes were completely covered in (tan, dull, sequin-shaped) all in neat rows on our faces. Very strange to see, but we just washed our faces and went on with our cleaning. The next few days or so my son kept saying he is getting bit. Then it started with me as well, leaving us both looking like our skin was getting eaten up. My sons went away with some Permithin cream slowly. The real problem is I have MULTIPLE SCLEROSIS, age 58 and think I may have to live with this forever!!! I just cant, it is hideous with red bloches, scabs, and I know it is a bug when I pull them off...One dermatologist even said I (and son had it too), had para-sicosis and needed to see a Psychologist. 2013 is when this started!!!!!!! My doctor I see every month has seen me struggle with this, I begged her to help me and she is.......QUESTION: The sulfamethox/trimethoprim DS 800-160 I just have been on for 6 days, 2 per day, for 10 days, was making me extremely short of breath, very dizzy and could not breath well at all, so I stopped it and left my Doctor a msg. Also, last night I looked into the toilet, after having a small amt of #2, and looked at my first 2 wipes of toilet paper.......I saw what looked to be the bug casings or whatever on my TP and I take my flashlight to see the inside of the toilet....who knows without testing, yes I can see lots of maybe maggots? tiny things in waste and around the sides were ???
QUESTIONS: Any clues on a name for this??? I thought it was a kind of bird lice from the start.
Is it better to take one per day or the generic Septa DS than none if I can tolerate?
Is the above drug supposed to kill any lice or just what in my system...because I have never experienced and toilet issues like I see now since the new pills, so I really hate to quit them, but must and the skin issues seem to be falling off.
Any kind of help is so greatly appreciated, believe me!!!!!!!!!!!
Thank you for your time and any help is extremely wonderful.
Sincerely,
Ms. Shar Hord