My husband cannot swollow solids for about 4 months now. he says it gets stuck at the back of his tongue and chocks him. what could the problem be?

Requires med checkup: Your history is worrisome. You should get a check up with your doctor to find the cause of difficulty in swallowing. it could be a tumor inside or it can be a muscle disorder. A gastro-enterologist can check you with endoscopy and guide your treatment further.

Needs timely eval: He is experiencing dysphagia that you can review on different sites, including Wikipedia. Causes are functional, as seen in strokes, for example or anatomic, infectious or caused by abnormal growth. Timely assessment is critical as otherwise it may result in nutritional deficit and significant weight loss.