Food Safety Report: Wendy's, Interstate 35 Frontage Road, San Marcos, TX, USA 7 years ago • details 11 Comments Comment Friend has swollen lips, throat feels weird, nausea,vand vomiting from eating a burger. I got a chicken sandwich and was ok. Wow, Wendy's of San Marcos. This just started. I went out and got them benedryl at 4 in the morning.