Hotel=bed bug bites on neck/back area 1 week ago. today swollen lymph node in neck. could this be the reason?

Yes: This is inflammation that lymph nodes help to control, and they may well enlarge in the process.

Sure they're bedbugs: ?? Bed bug bites may have no sx's/signs except for 2 small skin puncture points. A reaction may show from an hr to several days later. It can cause itchy, pink, swollen, lesions w clear center. If hypersensitive blisters may occur. Telltale sign is linear track of lesions from sequential feedings – doesn't always occur. Bites are in areas exposed while sleeping-arms, shoulders,neck & legs.