March-Hare - did you have a temperature or muscle twitches or spasms? had you taken more Tramadol than usual just before the event?
Care has to be taken when taking a tricyclic antidepressant like Amitriptyline and Tramadol together, as they both can raise serotonin levels causing symptoms like those which you have described.
I would see or ring your GP for advice about changing your medication.