Could dry mouth , numbness , & can't swallow be symptoms of diabetes ?

Yes, but: Yes, but there are other potential causes. Primary physician should be able to resolve.

Many possibilities: Numbness can occur from various reasons. Some potential causes include vitamin deficiency, nerve damage, nerve compression, and alcohol over consumption, side effects of different medications, or as a result of different systemic medical conditions such as diabetes. Get evaluated by a professional to determine the diagnosis. Treatment is based on the diagnosis.