A passport to better service?

Conversation in the Boots pharmacy near the hospital:
me: Hello, one bottle of Movicol liquid* please
pharmacy man [patronisingly]: No, Movicol is a powder that comes in sachets. It's not a liquid.
me: Yes it is, it comes in bottles
pharmacy man: No, it doesn't
me: Yes....
pharmacy man: No, we don't have it.

He was patronising in the extreme, and seemingly isn't used to patients/customers who actually know what they're talking about. Or just assumes that patients/customers don't know what they're talking about.
I've been taking this medication for a while, I know exactly what it is, I don't talk rubbish. I resented the implication that I do.

I found myself regretting that my NHS hospital badge was in my bag and not visibly about my person, as it had been half an hour earlier. It may say medical student, and not 97% doctor, but I imagine it would make it clearer that I do know what I'm talking about. I am so intrigued as to how things might have gone differently if I had been wearing it - I think the conversation would have been very different.
Having said that, I hate the idea that a hospital badge could have been my passport to good service and pleasant treatment. No patient should be assumed to be stupid, and made to feel so, and have to argue to get their valid request across, whether they have a hospital badge or not.

I don't want to be treated better than other people by virtue of my education or profession, I'd rather everyone was treated better.

I really hope after I left he went away and looked up his formulary, so that next time someone asks, he knows that Movicol liquid does exist, and isn't rude. Though I just hope he isn't rude regardless.

*Movicol liquid is a bottle of mild laxative that is diluted and drunk. It's better than the sachets because from a big bottle the dosage can be altered on a daily basis as required, whereas sachets come in a set dosage size. The liquid hasn't been available for very long, and I found out about it from an advert in the BMJ - is that more proof that I know what I'm talking about?!
Direct-to-consumer advertising for prescription medications is not allowed in the UK, as far as I understand (although Movicol is available over the counter in pharmacies as well as on prescription), so the BMJ advert is aimed at prescribers. But that doesn't stop patients like me from seeing it!

Medical student patient - research your own drugs

What do I, as a medical student, do when pharmacy assistant lady advises me to get a different over the counter (OTC) medication because 1. it's cheaper, 2. the one I need (has been previously prescribed but OTC is easier than hassling GP) is out of stock, and 3. "it's what they use in hospital"?
I don't take pharmacy lady's word for it, I go away and do my own research! Partly because I know that my medication is also used in hospital - I've seen it on drug charts plenty of times. But rather than just read about it, I've got a student formulary of 179 drugs to write (yes, I counted), so why not combine the two. I've been writing up my own personal research into the medications I should or shouldn't take, as formulary for submission. Two birds, eh?!

TMI

Interestingly,* it would appear that the usual prescription daily mild laxatives (best treatment for endometriosis I've come across) are suddenly no longer required when medical finals are looming. And that was just for a writing exam. I dread to think about the OSCEs - practical exams - coming later this week.

It never ceases to amaze me, all the complex effects that stress can have on our bodies. Mind and body are so intricately interwoven.

*Yes, I realise it's probably only interesting for me, because I'm a medic. Apologies for the TMI if this is not your cup of tea.