First Trip to China

Hello,

I am Canadian born Chinese and I will be travelling to Hong Kong and then China for medical investigation due to crazy wait lists in Canada. It will be my very first time in China and I am very anxious, especially since I only speak conversational Cantonese and no Mandarin. Please give me tips and recommend apps to use/download, if you also have any medical recommendations, I am very appreciative. Anything helps, even if you think I may already know.

Thank you in advance.

Edit to add: I will be there mid February to mid April.