Should I keep taking allopurinol if I am suffering a gout attack?

Yes keep taking your allopurinol.

Medications that lower uric acid are intended to prevent gout attacks and keep the condition from becoming chronic.Taking these medications can be challenging – as uric acid levels drop, crystals in your joints may shift, triggering another attack. However, sticking with your treatment plan is the best way to prevent future attacks.

You are best to talk with your doctor. You may be prescribed an anti-inflammatory medication such as ibuprofen or naproxen, colchicine or a corticosteroid to help with the attack.

https://www.drugs.com/health-guide/gout.html