What is chemotherapy like?

Right now I'm being kept alive with lots of Prednisone, furosemide and lovenox but it's not enough because my lung rejection is steroid-resistant. Soon I'm going to start a round of methotrexate to try putting my disease in remission. Has anyone here been on this chemo before? What was it like? How bad are the side effects? Is my hair going to fall out? Any advice appreciated, thanks