I had a root canal 2days ago. still lot pain.my concerne is that i feel exectly the same way - cold... hot... when touchs my tooth hurts really bad.?

Infection in bone: Root canal procedure clears/ cleans the tooth part of the infection, but there might be some peri apical infection in the bone which can take a few days to clear. Antibiotics and pain meds will help. Sensitivity to hot or cold might be with one or more adjoining teeth which might have some issues. Please have all your remaining teeth checked.

Another tooth: It is not unusual for a tooth to be sensitive after a root canal. Adjusting the bite should reduce the pain to touch. But hot and cold pain is probably coming from another tooth.

Was RCT completed?: If the tooth had the rct completed, the nerve, blood supply & all tissue is removed from the canal(s) and therefore it is impossible to feel sensation to hot & cold from that tooth, although it is not uncommon to feel soreness to touch for 1-3 days. If the rct was only started & not completed yet, you could still feel sensitivity to pressure, cold &d hot. Discuss your symptoms with your dentist.

Multiple causes?: It is possible that (1) the root canal treatment is not fully completed. (2) it is "completed" but a canal was "missed" and a nerve is still signaling hot / cold sensitivities. (3) you had two teeth in need of therapy and only one was treated . (4) the wrong tooth was treated. If your dentist (specialist or g.P. Is unable to determine the cause, get a second opinion from an endodontist.