I had my wisdom teeth sockets flushed by the oral surgeon and have had moderate to severe pain in the adjacent molar ever since. should i be worried?

It depends: Not really if the tooth discomfort is triggered by hot, cold, sweet, or sour foods and drinks, or even by breathing cold air. And yes if the discomfort is spontaneous, for no reason, sharp, and sudden. Best advice is to have the tooth evaluated and xray.

Adjacent cavity?: Was the wisdom tooth next to the painful molar or was it under the gumline/impacted? Are your teeth chronically sensitive? When x-rays were taken for your extractions and were not told about any new cavities, then the gums may not have healed enough around that molar, causing sensitivity to cold/hot. If you are having chronic pain, see a dentist to make sure you don't have a cavity.

Yes: When was the wisdom tooth extracted? If it was a recent procedure i would wait for the pain on the adjacent molar to subside while the healing of the extraction site is taking place . If the procedure was not recent then an x- ray and clinical exam should be done to determine the nature of the pain.

Probably not: Initially when a tooth is extracted the adjacent teeth have a small part of their roots exposed until the gums and bone fill the socket as it heals. This often causes some discomfort to cold water or sweets. If the pain only lasts for seconds, i wouldn't be concerned. However, if it lasts for minutes, is spontaneous, or increases in severity or frequency, i would suggest it be re-evaluated.

Doubt it.: Anytime wisdom teeth are removed, sometimes the other teeth are traumatized. This can often be caused from instruments used or having bone removed. Sometimes, the pain is even referred from the extraction site. As long as things aren't getting worse, and you can manage the pain, i wouldn't be too concerned. Keep smiling !