I had my first rituximab infusion last Tuesday & due another next Tuesday. Since a few days after the infusion I have had terrible stomach problems, feeling very weak, lightheaded & flickery eyes. Saw gp on typically my best day but stomach pain started again after an hour of being home. Said no sign of infection could only find swollen glands in neck. Might be a bug or the new drug. I'm scared of the side effects & don't know if I'm just freaking myself out!