near overdose with hydrocodone?

[artisian]

So the other day my good friend swim bought three 5mg hydrocodone pills. He had read about how they can be potentiated using grapefruit juice and tums. So swim decided to try it out. (it was swims first time trying hydro and he hadn't eaten all day) He went out bought some grapefruit juice and drank around 8 oz. Half an hour later he chewed two tums pills and washed down two hydros with some water. He was wating to feel something but all that really happend was he got really relaxed. Maybe like an hour or more after the two pills when he wasn't really feeling any euphoria he decided to eat another tums and take the last pill. He waited a while and got a little more relaxed but nothing special. Swim was hungry so decided that he was going to smoke a bowl and eat some food. Swim did just that a little while after that when he was sitting at his computer he started to feel like he couldn't catch his breath. He was breathing alright but it felt like his body was not absorbing the oxygen. Swim started to panic when this happened he had never experienced anything like this before. He started to take deep breaths and that seemed to help. He was feeling really drowsy and wanted to fall asleep. He decided that it would be best to go out side and sit down on the front steps of his house where his neighbor could see him in case he passed out or something because he felt like he was. So he did just that and he calmed down a bit but he got even more sleepy. He went back inside and his whole body was shaking. He decided to wash some dishes to keep awake . Then the same thing started to happen but this time he also started to feel nousious so he went back outside and did the same thing. Again he started to feel real sleepy so he went back inside to continue. Same thing happened again he felt like he couldn't breath and got nausious only this time he almost did throw up. He decided to sit outside untill he felt better and eventually he did. The whole thing lasted maybe like an hour and a half. This was a scary experience for swim. He was wondering if he was close to overdosing or what. He did some search and it also sounds like a panic attack but swim is not sure hes never had anything like this happen before. Sorry about the lenght of this.