Day 2 of being on Doxycycline Hyclate. I woke up with pain behind...

Day 2 of being on Doxycycline Hyclate. I woke up with pain behind my eyes and a strange "out of touch" feeling. I took my next pill for the day. No issues with it going down, but I have felt flu like symptoms most of the day. Some chills, possible fever (face and mouth feel hot but at work so can't check it), some aches especially in the legs, like mild cramps, and an overall sick feeling across my body. I do not feel myself today, however I felt normal if not better yesterday, the first day I started taking it. I contacted my doctor and informed them of how I felt and she told me it is only my second day taking it and to continue as normal. I will do as recommended, however, I hope these feelings dissipate soon. I want the cough to be gone but at what cost. If I feel like this tomorrow I might not go to work and maybe have a second opinion.