lake I have an enlarged thymus gland and i'm only 22, does any1 know about this?

i am currently a potential kidney donor to my sister and ive been getting tests done for a few months now, everything has been absolutely perfect! I am in the last step of the testing process and now im stalled(talk about bad luck) first they found nodules on my left lung ranging between 1.5mm-4mm after another ct scan they ruled anything bad out. In that ct scan they also noticed my thymus gland is bigger than it should be for my age. I have muscle weakness,eye weakness,neck pain and get tired out very easily. If all of my other blood tests came back fine and the thymus is all about the immune system then what the hell could be wrong? I am waiting for the doctors in Boston(Beth Isreal Medical Center) and Cooperstown NY(Bet Healthcare)to make up their minds on what to do(considering a biopsy)..well idk dont mind my ramblings im high on the pain killers i recieved lol..any input would be much appreciated thanks for you time!there