First two cycles I did I got “test flu,” whatever the hell it is. I imagine it is your body reacting negatively to the foreign substance you are introducing into it, and using the fever as a means of fighting off this imaginary foe. First time I got it it was really bad, like I was shaking like crazy, had whole-body muscle-soreness, fever, chills, the works.
I had to go to bed early (which I never do) and cover myself up with about three blankets. Next day, however, I was pretty much fine, but I would get a little bit of it toward the end of the next few evenings, though incrementally less bad. It completely disappeared after about a week. Then I gave myself food poisoning, but that’s a different story!
From the limited amount of information you give this is what it sounds like to me. If things don’t change, of course, you will need to take measures to take care of yourself.
I hope you are injecting that sus at least EOD…