I’ve already had mono and it’s not that.
What else can cause extreme tiredness & exhaustion?

There are many different things it could be so only a Doctor will be able to figure it out. If you have a fever, it is usually an indication that your body is fighting off a virus or bacteria. Your bodies temperature goes up because this will help eliminate the intruder in your body. But the problems with fever is that if your body temperature gets too high it can harm you.
Here you will find more information on fevers:

http://www.emedicinehealth.com/fever_in_adults/article_em.htm

It sounds like its best you go to the doctor especially if you don’t see an improvement or if it gets worst.

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