I just finished a juice fast and about to start herbs. But I got hit by flu symptoms today. Should I wait now?

After waking up today I have nausea and stomachache, my heart beat rate is 100-105 all day now and I have a strong headache. It makes me unable to sleep at all.. My temperature is 101 F now.

Should I take pain killers since I just break from my juice fast.
Also has anyone had flu/cold during recovery? I have feeling that my body is overreacting now. I used to get flu before PFS but I never felt uncomfortable like this before.