Having alot of problems after 3 or 4 infusions...Help?

I've had 3 of 4 infusions, last one being 2 weeks ago. I have suffered with a low grade fever for a week, my oxygen drops to the 80's on room air, low blood pressure. I've had to go in 3 times for IV fluids in the last 2 weeks. I wear O2 at nite, so luckily, I have O2 at home. My fever started a week ago today, saw my doc on Monday, lots of blood work, cultures, chest xray. Nothing found. Been on Levaquin (broad spectrum antibiotic) for 5 days. Still have fever and all the symptoms listed above. Doc sent me to ER on 2 days ago. More blood work, cultures, chest xray and ct scan of chest looking for pulmonary embolism as the possible cause of the low O2. Chest xray showed some "fuzziness" in my upper lung lobes, doc at ER diagnosed me with "atypical pnuemonia". CT scan normal. Stay on antibiotics and O2 at home, should get better. But I'm not better! Had fever and chills last nite at 10 and again at 7 this morning. Little fever this afternoon. Plus, i have a horrible dry cough that is just bone racking!! I'm just stuck at home and chained to the O2 and recliner with dizziness and some disorientation. Doc says that most of this could just be "chemo related". My last infusion in Dec 26. My sister, who is the office manager of a cancer clinic, thinks I should forego the last treatment. I am so sick of being sick. Any suggestions??