Hi.. Welcome to HEALTHCAREMAGIC.. As per your complain, in case if you have severe pain in tooth and tooth is also loose then it can be probably due to causes like deep decay leading to tooth abscess formation while can also be due to fractured tooth or deep gum infection.. Loosening occurs due to elevation of tooth from the socket due to pressure caused by the us being formed under the roots.. The exact cause can be ruled out by x ray and treatment of the tooth can give you permanent relief and not alone medication.. As of now you can take anti inflammatory painkiller like Ibuprofen for relief from pain.. Apply clove oil over the tooth for pain relief.. Do cool compresses over the cheek.. Avoid chewing from painful side.. For nausea you can take Ondensarton and drink lemon water.. Hope this helps.. Regards.