What to do if I have a swollen neck gland?

See physician. A swollen nodule in the neck could be a lymph node or a host of other conditions. See your physician if this does not improve within a week.
Swollen glands. this is a normal response to an infection. Leave a swollne gland alone, but increase fluids and rest. You can consider increase antioxidants like Vit C, or herbal or homeopathic remedies.