Tooth and Mouth Problems

Hello all, I am going through root canal treatment currently. Today I finished my 2nd sitting which concluded overall treatment. As per doctor, the only part remain is the taking crown size and then next sitting will be positioning the crown. But I am still feeling sensitivity on the treated and surrounding teeth. It's the upper side 3rd teeth from the left. Assuming that senses to the treated teeth has been removed, then why still having sensitivity and pain upon drinking water(slightly cold water) . Is it common to have,or there can be other mystery.

Pain in eyes ears and jaw line I chewing anything after that mild pain is start what should I do is any thing serious

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I had mocucels so i did surgery after two week it came again in same place what should it do now will it go by own

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I was gone through RCT in my moral teeth 5 months ago but now i am seeing a small bump on my gum from past 1 day for now it's quite small and not painful but i am afraid because the last time RCT process was very time taking and very painful i don't want to go through something like that again. Please help

Is root canat painful Please answer i am really anxious please help me... ... ... ... ... ... ... ...