Thanks for posting your query,
According to your description , pain and swelling seems to be inflammatory in nature.It could be a acute attack of gout
I advice you to give you rest to the part affected, take anti-inflammatory drug like motrin
1 tablet with food as and when required (upto 4 tablets daily) to reduce pain and inflammation and consult your doctor for thorough examination and rule out any infective cause.
I hope this information has been both informative and helpful