I had the feverish feeling too. But I am not sure if it is identical to what you are experiencing. My problem started after the anti bio course. That was when I felt so debilitated.
I used to feel feverish very often.

1) How is your Rheumatoid Arthritis (RA) factor. There may be a link. Prbably a combination of weak immune system ( after anti bio use ) and/or RA factor and is your problem.

2) Try some extra Zinc and Vit C. In my experince these helped me to improve immune system. Also, take some organic honey every day.

3) Avioid cold drinks. Only use boiled and cooled water. You could add some cumin seed for taste

4) Avoid sugary stuff like doughnuts, icecream etc

5) Try the herbs mentioned here.

6) Avoid alcohol completely

(I am not sure if Levoqn would help you. But it is your call.)

Does it make sense?