Hi there Jen~
I understand your concerns. The description of your small bumps on your knucles seem concerning and they are probably a viral infection called molluscum contagiosum
or the usual calluses
. They probably will go away with good hand hygiene. However you might want to consult a dermatologist
for the same. I hope you are doing well otherwise. The cold
sweats seems to be weather related. A thyroid
check to find out if everything is normal should be in place during your next doctor's visit. I hope this helps.
Take care and have a lovely day!