I started Imbruvica/Ibrutinib April 13, 2020. Had chills and fever after 2 days and then no fever since then but very weak and get dizzy at times and fainted twice. I wonder why my body feels like a pounding sensation. It. not coming from my heart. I could be lying in bed and it happens and also when walking up the stairs in my house. Is this the normal side effects of the pills? I wlll have a follow up soon with my doctor.