I (18M) asked my father if I could take my vyvanse late (5pm) today to finish some schoolwork I have to do. He asked me if I was planning to go out, which I didn't, so he agreed to letting me take it on basis of finishing my schoolwork.

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I didn't plan on going out because a friend of mine was supposed to come over tonight. He knew this from days ago, and let me take the medication even after I clarified the intention of me staying in was because my friend planned on coming over. As soon as I go back to my room my friend texts me saying there is a possibility of having to cancel our plans. I figured I didn't want to stay home all night idly (because the work I have to finish can be done relatively quickly if I apply myself to it, which I plan to do). I went back to his room and asked if I could end up going out IF my friend did not come over. I barely managed to finish the sentence before he began hollering at me about being ridiculous for not keeping an agreement for more than 10 minutes. I asked him, extremely calmly, to not yell at me for asking for this on basis that I had agreed to not go out because I expected my plans to go through, however felt it'd be fair to establish a backup plan given the uncertainty. 

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I was annoyed by his reaction because of the excessive yelling because my family is currently undergoing a therapy process which mainly revolves around being kinder to each other (my family's extremely dysfunctional/aggressive, especially when disagreeing with each other, and everybody basically reached their limits, so we collectively decided to seek out professional help) and that went completely out the window without much build-up or an extensive argument (as is common). I understand that he is in the right to be annoyed over me suddenly contradicting the terms I had agreed to in order to take the medication. I also understand that given my history of drug use (which he was fine with) and currently undergoing treatment for Bipolar Disorder II he is right to be concerned about me taking amphetamine-based medicine and going out, therefore implying taking other substances such as alcohol, which he is not opposed to but prohibited me from engaging in recreational drug use (admittedly I never was the most obedient teenager, so it's sensible for him to be suspicious).

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 I truly had no intention of drinking, smoking or taking anything because I did drink some beers yesterday and am feeling quite exhausted, but simply wanted to meet up with my friends and meet new people tonight, but that's not something he'd believe in. I just think it was a bit unreasonable for him to get furious and attacking my integrity/reliability over me asking if he'd allow my plans to go out change given original circumstances for agreeing to his terms changed. If this was a matter of more serious commitment, I'd understand him. He still argues that he's allowed to be this angry. I really don't know if I was wrong to just ask.

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TL;DR: Asked dad to take meds to work. He said only if I wouldn't go out. Agreed because I had confirmed plans for a friend to visit me. Friend said plans MAY fail. Asked dad if I could go out should they failed. He got extremely angry, yelled and attacked my integrity. Family currently taking therapy to work on treating each other without so much aggression, which he maintains to not have breached any promises to adhere to it.

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