Entyvio Side Effects

I am curious what side effects everyone has experienced while on Entyivo. Is it possible to develop additional symptoms overtime. I started Entyvio May 2018, no real symptoms aside from an occasional headache. I had my colonoscopy in December and from then on the side effects have been noticeably worse. The last couple treatments I occasionally feel tired, achy and chills like the beginnings of a flu. This occurs toward the end of the 8 weeks of the Entyvio treatment

If these effects are truly from the Entyvio I would have to consider if it's worth it.

Entyvio May 2018(Every 8 weeks)