"Accident and emergency"

I am writing this story because this is the second time this has happened to me, the first time we didn't pursue a complaint, however it has pretty much happened again, and I would like to know what measures are going to be put in place to prevent this from happening again.
 I arrived at A&E about 1820, I did not call an ambulance because I live minutes away and I feel this is a complete waste of resources. I had already been on the phone to NHS24 who told me they would fax details through. Fax machine wasn't working so explained to the receptonist at the desk that I was taking an allergic reaction and my throat was starting to swell. I was told to take a seat. After 10 minutes my wife returned to the desk and said I was starting to panic as my throat felt as if it was getting tighter, to which the response was you will get seen next. I was seen by a triage nurse at 18: 50 and assessed - I told the triage nurse my throat was extremely tight and the pressure at the back of my head was unbearable. At 19: 00 the nurse said to me we have no beds and I am aware you are a priority however I need you to take a seat out in the waiting area. We waited a further 10 minutes to which my wife then returned to the desk again asking for help, A nurse came to look at me and said he would be back. He arrived back at 19: 30 and asked me to come through; he couldn't find a bed for me. I was then finally assessed by a Dr and given adrenaline and hydrocortisone at 19: 40. I can see how busy the department was on this particular day, and I also can't thank the nursing and medical staff enough. However what I don't understand is the delay in treatment when I was specifically telling staff I needed to be seen and I needed the treatment.

Its been 7 years since I have had an episode like this so I had no medication to take at home, however the same scenario happened in accident and emergency where we were met with the same problem, so nothing has changed and I don't think thats acceptable. I look forward to your response.