Should I consider suing?

My son started having a breathing problem about a year ago. The first time I got scared and took him to the ER. On check in I told them my son was having trouble breathing, they made him wait, just to call a lady who was eating and chatting first. So I raised hell, and they called him in next. I saw it in his eyes that this problem was causing him pain. They didn't believe us and suggested he was lying, they did an X-Ray said his trachea was narrow and sent him home, no meds, no nothing. Plus he was still breathing very poorly. About 2 months later we moved and he had the same problem, this hospital admitted him and diagnosed him with VCD (Vocal cord dysfunction) which can be a serious problem. Worst case scenario he would need an emergency tracheotomy. Can I sue for negligence from the first hospital who did not take us seriously. (they actually asked him if he was fibbing)