Thanks, vardnas and mollyfin, for adding support!
Vardnas, you're on the money! While I did feel cold, chilled, and "like I had an infection", I also felt hot at different times during those 'fever' days, which is why I had to crank the a/c. Nothing bad came of the experience - it just felt miserable. Aunt Flo came to visit last night. Amazingly, most of my symptoms - the chills, extreme heat intolerance, breast pain, crippling anxiety / body irritability, etc. - began to disappear yesterday afternoon. I got a good night's sleep last night. Woke up this morning and felt like I do whenever I have my period. Just cramps and tiredness. This is good.
So, this little episode is over. Thanks again for everyone's support.