My med. Doctor thinks that I'm having fever because of Sertraline. Every med. That I've had have given me difficult side effects. What can I do?

Possible. If you can stop sertraline and fever subsides, your doctor was right. Some people are highly sensitive to medications. You may be one. Consider non-medication therapies meantime. I don't know why you are taking sertraline, but you may do better than you think exploring other strategies to feel better: eg, psychotherapy, exercise, meditation, yoga, improving your nutrition etc. Hope this helps.