As you told that you have a pain since last two days. I think there may deep cavity in a tooth, and most probably there is a periapical infection. So my opinion is to visit an Endodontist and take a x-ray then only you got the right Diagnosis, may be this case will come for Root Canal Treatment. For the time being take 2 Tabs of Ketrol-DT diapers in a water and drink you will got some instant relief but this is a temporary treatment.
Next Steps
Root Canal Tretment
Health Tips
Until the R.C.T will be start eat only soft diet. And don't eat anything from that side.