I have been diagnosed with rheumatoid arthritis which I have had for about 20 years quite mildly and not used medicines apart from naproxen, I've recently had an attack affecting knees and wrists and now have been advised to go on methotrexate, having read lots of comments about I am terrified to take it. I need advise is there anything we else less scary side affects? What will happen if I don't take it.