My body temp was 101.5 and i had sweating and heart palpitations 1.5 months after epidural steroid injection with 8 year history of zoloft (sertraline) use. is this serotonin syndrome?

No.: We doctors have a saying: "when you hear hoofbeats, don't think of zebras." in other words, common things occur much more commonly than rare things. Serotonin syndrome is rare, and typically occurs immediately after taking a drug, not 1.5 months later. The most likely cause of a fever and palpitations is a viral illness. Let your doctor examine you, to put your mind at ease.

Probably not: This is probably not serotonin syndrome. But with all the difficulties people have had with epidural steroid injections recently, you do need to be seen by a physician very soon -- even emergently. That is, unless what you're describing is something that happened in the past, is now resolved, and you're now well with no symptoms.