Maybe it would be good to remind yourself that nothing has really happened that should warrant those worst case scenarios to occur.

As I understand, you sent your T a letter addressed to someone else and the T responded something that made you think that you have done something wrong again.

But you haven't done anything wrong, right? You have texted your T but as you said - you have an agreement with T that this is ok. Thus, this can't be wrong. You sent the letter to the T instead of sending to the pharmacist - I believe this was the best thing to do in this situation and thus clearly can't be wrong either.

Or what else do you imagine what have you done why these worst case scenarios might realise?