Hello my name is ***** ***** I will help you with this.
You accept you swore, several times - that is the issue here.
The act states:
(1) A person is guilty of an offence if he -
(a) uses towards another person threatening, abusive or insulting words or behaviour,
with intent to cause that person to believe that immediate unlawful violence will be used against him or another by any person, or to provoke the immediate use of unlawful violence by that person or another, or whereby that person is likely to believe that such violence will be used or it is likely that such violence will be provoked.
If you used abusive words and you accept the person in McDonalds starting shaking, he may have feared you
If that was the case the offence is made out, even though you are drunk
If you caused the person serving to think you may be violent you have committed the offence even if you did not intend to
Based on what you have said, the swearing, the shaking cashier, it sounds like it was made out.
If you accept a fixed penalty you wont need to declare it as it is not a conviction
If you refuse a fixed penalty the Police may charge you and it may go to Court. If it does and you are found guilty, then you will have a criminal conviction
I am sorry if this is not necessarily the answer you want and certainly not the one I want to give you, but I have a duty to be honest
Can I clarify anything for you about this today please?