This link is so useful and informative that I will post it periodically for new members and those who haven't seen it before. So just ignore if you've already looked at it.
Even if you just scroll down to the part on the lymphatic system it will explain a lot: medicalnewstoday.com/articl...
What a shock 
Seeking information: Splenic Marginal Zone Lymphoma
Radiotherapy treatment for nhl
Hot flashes & cold sweats