I have scoliosis and also possible anemia. Is that a valid reason to stop intense exercises?

No. You and your physician do need to find the cause of your anemia, as it is more than just something that will make you feel poorly -- you may have serious, treatable disease. Some degree of scoliosis is extremely common and even seriously crippled people can stay fit. I'm very glad you are interested in staying fit -- good luck.
Exercise /scoiliosis. Depends on the severity of the scoliosis. Scoliosis under 30 degrees performs much like a straight spine what are the scolisis measurments?