Hi, if the tonsils have been removed, its unlikely that the swelling is due to tonsils. It could be scar tissue. Gastroesophageal Reflux Disease (GERD), can cause problems with swallowing, which is caused due to reflux of acid from the stomach into the esophagus. It could also be due to disorders of the esophagus. You will need to consult your primary care physician who will examine your throat and may ask for some tests like barium swallow or endoscopy to determine the cause for difficulty in swallowing. Regards.
Forgot to say, there is no pain at all.