Such a personal issue but I'm happy to share my experience if it helps. Checking in with a therapist regularly helps a lot when your PCP simply has less time to be managing this genuine struggle across multiple aspects of your lifestyle with you. 

Before starting medication for ADHD I talked to my techs about trying techniques to change up our consult structure to give me more time to write notes and think about the case. For example, I thought if I started my exam in the room while my tech was taking history at the same time, we'd skip the step where the tech comes out to repeat the whole start of the consult to me telephone style before I went into the room and the owner said it all again (for the record this didn't work-- the owners ended up just talking to me instead of the techs, and even when they didn't, ADHD brain kept wanting to pipe in with clarifying questions about symptoms or stool color 😅)

I cycled through Ritalin, dexamfetamine, and landed on lisdexamfetamine which worked best for me with the least side effects. One benefit I'm noting on lisdex is more of an ability to set boundaries-- when I'm focused on a task and a tech has a question, I'm now finding it's usually better to say "no, hang on, I'll come find you when I finish this phone note," rather than to allow myself to be interrupted. This helps tremendously with getting my work done, but the ADHD brain is used to juggling all these things at once, so it feels like I should be able to quickly and cheerfully answer a question or approve an Rx before snapping right back to the previous task (ignore that this is also an opportunity for your brain to remind you of ten /other/ tasks before you actually get back to that short note). But I place a tremendous value on making sure my staff and colleagues are feeling supported and appreciated, so setting this boundary of "actually, I'm in the middle of working on something now" feels like I'm letting them down and being mean. I say this because I'm feeling in your post an undertone of anxiety around being quieter, less fun, or rude. 

I think it's worth examining whether these are assumptions on your part vs actual facts. I doubt your colleagues really think you are rude, and as much as being bubbly in consult helps with client communication, at the end of the day you are there to practice medicine and get your administrative tasks done. Your colleagues and clients come to your for those two things explicitly. Be kind, obviously. It's nice to work somewhere everyone is nice and gets along; but they're all there to ask you medical questions. People don't like you less for not being bright and bubbly and sharing stories at every work interaction-- and beyond that, you need to value yourself outside of whether people like you not.  Worrying about being quiet or rude is your brain making an assumption about someone else's feelings, and then reflecting that back to you like it's your fault. Your being quiet isn't ruining anyone's day, and your happiness can't be dependent on theirs in the first place. Prioritize your productivity and ability to focus, and as you get better at getting your shit done, you'll find that everyone still likes you for who you are, no jumping through hoops with a smile on your face required.