Hey, I'm a trans guy too. I'm only just starting to transition myself so I don't have much advice to offer I'm afraid... It really sucks dealing with constantly being misgendered, and having to deal with a body that doesn't feel right...
When it comes to dealing with the gp and other doctors perhaps it would help if you wrote down what you want to say, an intro letter of sorts, that way you could take your time with writing it and have it all there and clear for them to read rather than having to struggle with the verbal communication as much?
If yu haven't heard anything from the GIC since jan there's no harm in contacting them to confirm they've recieved your referral and where you are on the waiting list.
Wishing you all the best with things